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annotate artifacts/doc/datacage_ref_de.rst @ 9461:da7b5f07303d
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author | gernotbelger |
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date | Wed, 29 Aug 2018 17:27:09 +0200 |
parents | 081a57c80540 |
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rev | line source |
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First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
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1 ========= |
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2 Datenkorb |
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3 ========= |
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4 |
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5 |
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6 .. contents:: Inhalt |
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7 |
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8 Übersicht |
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9 --------- |
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10 |
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11 Der Datenkorb ist im Kern ein Dive4Elements/River eingebetteter Webdienst, |
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12 der dazu dient, ein XML-Dokument zu generieren, das seinerseits benutzt |
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13 werden kann, um Daten so identifizierbar zu machen, dass sie zu |
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14 Projekten innerhalb von Dive4Elements/River hinzugeladen werden können. |
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15 |
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16 Das vom Datenkorb erzeugte XML-Dokument wird dann vom D4E/River-Client in |
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17 eine Baumansicht innerhalb der graphischen Benutzeroberfläche |
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18 transformiert. |
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19 |
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20 Die Grundlage für das XML-Doument, das an die Oberfäche gesandt wird, |
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21 ist ein XML-Dokument namens ``meta-data.xml``, das im ``conf``-Verzeichnis |
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22 des Servers als Template für die Ausgabe-XML benutzt wird. |
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23 |
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24 Dieses Referenzhandbuch beschreibt die Strukturen innerhalb von |
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25 ``metadata.xml``. |
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26 |
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27 Grundstruktur |
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28 ------------- |
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29 |
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30 Das Grundgerüst einer validen ``meta-data.xml`` sieht sieh so aus: |
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31 |
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32 .. code:: xml |
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33 |
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34 <xml version="1.0" encoding="UTF-8"> |
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35 <dc:template xmlns:dc="http://www.intevation.org/2011/Datacage"> |
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36 <datacage> |
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37 ... |
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38 </datacage> |
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39 </dc:template> |
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40 |
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41 Dies erzeugt folgendes Dokument: |
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42 |
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43 .. code:: xml |
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44 |
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45 <xml version="1.0" encoding="UTF-8"> |
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46 <datacage> |
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47 ... |
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48 </datacage> |
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49 |
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50 Elemente, die nicht aus dem Namespace ``dc`` stammen, werden durchkopiert. |
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51 ``dc``-Elemente dienen der Steuerung des Templating. Generell kann sagen, |
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52 dass das ``meta-data.xml``-Template mittels einer |
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53 rekursiven Tiefensuche (siehe http://de.wikipedia.org/wiki/Tiefensuche) |
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54 über seine Elemente abgearbeitet wird. |
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55 |
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56 Daten |
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57 ----- |
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58 Im Datenkorb stehen zwei Arten von Daten zur Auswertung zur Verfügung. |
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59 |
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60 ``Datensätze`` |
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61 ~~~~~~~~~~~~~~ |
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62 Datensätze sind Tabellen mit benannten Spalten. Sie werden von Datenquellen |
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63 erzeugt und in einem Stapel verwaltet. Die konkreten Werte stehen erst durch |
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64 Auffaltung als Variablen zur Verfügung. |
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65 |
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66 ``Variablen`` |
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67 ~~~~~~~~~~~~~ |
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68 Variablen sind die Werte, die aktuell zur Auswertung zur Verfügung stehen. Sie haben |
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69 einen Namen und einen Typ (String, Zahl, durch Datenquelle bestimmt). |
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70 |
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71 Textersatz |
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72 ---------- |
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73 Um die Wertebelegungen in das Ausgabedokument schreiben zu kann an entsprechenden |
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74 Stellen eine String-Interpolation durchgeführt werden. |
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75 Hier finden zwei Arten von Textersatz ihren Einsatz. |
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76 |
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77 ``${}-Ersetzungen`` |
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78 ~~~~~~~~~~~~~~~~~~~ |
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79 Die ältere Variante. Innerhalb von Strings werden hier nur Variablen aufgelöst. |
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80 Beispiel: "**Hallo, ${planet}!**" wird bei planet = 'Welt' zu "**Hallo, Welt!**". |
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81 |
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82 ``{$}-Ersetzungen`` |
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83 ~~~~~~~~~~~~~~~~~~~ |
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84 Die neuere Variante, allerdings noch nicht komplett an allen Stellen einsatzfähig. |
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85 Innerhalb der geschweiften Klammern können beliebige XPath-Ausdrück stehen, die |
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86 zu Strings evaluiert werden. Dies orientiert sich an den String-Auswertungen in XSLT. |
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87 "**{ concat($greet, ', ', $planet, '!') }**" wird bei gesetzten Variablen greet = Hallo |
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88 und planet = "Welt" zu **Hallo, Welt!** ausgewertet. |
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89 |
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90 Datenkorb-Elemente |
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91 ------------------ |
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92 |
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93 Datensätze erzeugen |
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94 ~~~~~~~~~~~~~~~~~~~ |
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95 |
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96 ``dc:context`` Aufspannen eines Gültigkeitsbereiches eines Datenbankdatensatz |
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97 ............................................................................. |
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98 |
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99 .. code:: xml |
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100 |
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101 <dc:context connection="Verbindung"> |
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102 ... |
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103 </dc:element> |
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104 |
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105 Spannt einen Gültigkeitsbereich für einen Datensatz auf, der aus der Datenbank |
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106 kommt. Die adressierte Datenbank wird über das optionale Attribut 'connection' |
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107 bestimmt. Zur Zeit sind drei Datenbanken angebunden: |
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108 |
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109 - **user**: Die Index-Datenbank des Artefakt-Servers. Hierüber stehen Meta-Informationen |
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110 zu alten Berechnungen zur Verfügung. |
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111 |
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112 - **system**: Die FLYS-Datenbank mit den hydrologischen, morphologische und geodätischen |
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113 Daten. |
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114 |
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115 - **seddb**: Die Sediment-Datenbank. |
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116 |
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117 In einem `<dc:context>`-Element wird zwingend ein `<dc:statement>`-Element erwartet, |
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118 um einen Datensatz aus der Datenbank zu holen. Dieser Datensatz steht dann innerhalb des |
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119 `<dc:context>`-Elementes ein oder mehrfach zur Verfügung. Innerhalb eines |
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120 `<dc:context>`-Elementes können weitere `<dc:context>`-Elemente eingeschachtelt werden. |
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121 Ist kein 'connection'-Attribut vorhanden, wird die Datenbank-Verbindung des umgebenen |
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122 Kontextes weiterbenutzt. Initial wird je nach Aufrufart des Datenkorbs entweder |
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123 der **user** oder **system**-Kontext angenommen. Dies richtet sich danach, ob in |
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124 der Aufrufumgebung ein Artefakt gesetzt wird oder nicht. Im ersten Fall wird |
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125 angenommen, dass es sich um einen Ladevorgang für zusätzliche Daten handelt, die |
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126 auch alte Berechnungen mit einschließt. |
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127 |
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128 |
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129 ``dc:statement`` Holen eines Datensatzes aus einer Datenbank |
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130 ............................................................ |
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131 |
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132 .. code:: xml |
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133 |
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134 <dc:statement> |
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135 SQL-Select-Statement. |
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136 </dc:statement> |
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137 |
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138 Mittels eines SQL-Select-Statements werden in einem `<dc:context>` Elemente aus |
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139 der dort definierten Datenbank geholt. Die Spaltennamen der Projektion des SQL-Statements |
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140 werden übernommen und später beim Auffalten des Datensatzes benutzt. |
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141 |
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142 ``dc:container-context`` Tabellarische Daten aus der Programm-Umgebung |
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143 ...................................................................... |
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144 |
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145 .. code:: xml |
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146 |
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147 <dc:container-context container="Container"> |
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148 ... |
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149 </dc:container-context> |
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150 |
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151 Dies spannt einen Kontext auf einem Container namens Container auf, |
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152 einer listen-ähnlichen Struktur, die als externe Datenquellen in |
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153 Form eines Java-Objekts an den Datenkorb übergeben werden kann. |
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154 Dies müssen Klassen sein, die das Interface ``java.util.Collection`` |
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155 implementieren. Mit diesem Konstrukt ist es möglich, tabellarische |
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156 Ergebnisse von außen in die Auswertung des Datenkorbs zu integrieren. |
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157 Der Container muss hierfür über die Variable ``Container`` zur Verfügung |
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158 gestellt werden. Die Spalten des Tabelle werden über ``dc:properties`` |
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159 definiert. Der Datensatz selbst kann wie gewohnt mittels ``dc:for-each`` |
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160 realisiert werden. |
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161 |
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162 ``dc:properties`` Spaltendefinitionen für externe Daten aus der Programm-Umgebung |
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163 ................................................................................. |
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164 |
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165 .. code:: xml |
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166 |
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167 <dc:container-context container="Container"> |
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168 <dc:properties> |
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169 <dc:property name="name" alias="alias"/> |
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170 </dc:properties> |
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171 </dc:container-context> |
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172 |
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173 Muss innerhalb eines ``dc:container-context`` angegeben werden und enthält eine |
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174 Liste von Attributen der Java-Objekte, die in den Datenkorb eingeblendet werden sollen. |
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175 Die Auflösung der Namen auf der Java-Seite funktioniert nach Konvention von Java-Beans, |
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176 sprich aus ``name`` wird ``getName``. ``alias`` ist optional und weisst explizit einen |
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177 Spaltennamen aus. Dies entspricht im Wesentlichen einen 'AS' bei einem SQL-Statement. |
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178 |
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179 Ein vollständigeres Beispiel könnte in etwa so aussehen. |
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180 Die Java-Seite: |
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181 |
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182 .. code:: java |
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183 |
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184 public class Car { |
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185 |
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186 private String marke; |
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187 private String name; |
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188 |
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189 public Car(String marke, String name) { |
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190 this.marke = marke; |
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191 this.name = name; |
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192 } |
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193 |
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194 public String getMarke() { |
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195 return marke; |
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196 } |
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197 |
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198 public String getName() { |
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199 return name; |
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200 } |
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201 } |
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202 |
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203 // Liste befuellen. |
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204 |
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205 java.util.Container<Car> container = new java.util.ArrayList<Car>(); |
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206 |
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207 container.add(new Car("Volvo", "V80")); |
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208 container.add(new Car("Ferrari", "Testarossa")); |
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209 |
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210 // Dem Datenkorb uebergeben. |
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211 |
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212 parameters.put("CARS", cars); |
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213 |
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214 Das Datenkorb-Schnipsel |
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215 |
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216 .. code:: xml |
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217 |
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218 <dc:container-context container="cars"> |
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219 <dc:properties> |
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220 <dc:property name="marke" alias="brand" /> |
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221 <dc:property name="name" alias="type" /> |
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222 </dc:properties> |
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223 |
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224 <cars> |
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225 <dc:for-each> |
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226 <car type="$type" brand="$brand" /> |
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227 </dc:for-each> |
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228 </cars> |
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229 </dc:container-context> |
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230 |
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231 liefert dann folgende Ausgabe: |
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232 |
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233 .. code:: xml |
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234 |
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235 <cars> |
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236 <car type="V80" brand="Volvo" /> |
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237 <car type="Testarossa" brand="Ferrari" /> |
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238 </cars> |
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239 |
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240 |
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241 |
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242 ``dc:virtual-column`` Virtuelle Spalten definieren |
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243 .................................................. |
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244 |
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245 .. code:: xml |
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246 |
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247 <dc:virtual-column name="Name" type="Type" expr="XPath-Ausdruck"> |
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248 ... |
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249 </dc:virtual-column> |
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250 |
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251 Definiert eine neue, virtuelle Spalte namens Name für den aktuellen Datensatz. |
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252 Der Typ wird optional durch Typ festgelegt; ohne Angabe wird der Typ String angenommen. |
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253 Die Wertebelegung ergibt sich aus der zeilenweisen Auswertung des XPath-Ausdrucks. |
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254 |
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255 Dies sei an folgendem Beispiel illustriert: |
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256 |
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257 +----+ |
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258 +Zahl+ |
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259 +====+ |
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260 + 1+ |
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261 +----+ |
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262 + 2+ |
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263 +----+ |
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264 + 3+ |
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265 +----+ |
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266 |
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267 .. code:: xml |
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268 |
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269 <dc:virtual-column name="Quadrat" type="number" expr="$Zahl * $Zahl"> |
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270 ... |
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271 </dc:virtual-column> |
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272 |
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273 Erzeugt einen neuen Datensatz folgender Struktur: |
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274 |
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275 +----+-------+ |
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276 +Zahl+Quadrat+ |
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277 +====+=======+ |
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278 + 1+ 1+ |
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279 +----+-------+ |
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280 + 2+ 4+ |
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281 +----+-------+ |
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282 + 3+ 9+ |
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283 +----+-------+ |
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284 |
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285 Innerhalb eines `virtual-column`-Elementes kann der Datensatz mittel `dc:for-each` wie |
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286 gewohnt realisiert werden. Wird das `dc:virtual-column`-Element verlassen, gilt wieder |
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287 der vormalige Datensatz ohne die zusätzlich Spalte. |
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288 |
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289 Datensätze einschränken |
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290 ~~~~~~~~~~~~~~~~~~~~~~~ |
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291 |
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292 ``dc:filter`` Selektieren einzelner Zeilen aus dem aktuellen Datensatz |
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293 ...................................................................... |
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294 |
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295 .. code:: xml |
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296 |
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297 <dc:filter expr="XPath-Ausdruck"> |
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298 ... |
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299 </dc:filter> |
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300 |
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301 Evaluiert pro Zeile des aktuellen Datensatzes den XPath-Ausdruck 'expr' und erzeugt |
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302 einen neuen Datensatz, der nur die Zeilen des Originaldatensatzes enthält für den |
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303 die Auswertung logisch wahr ergab. Im XPath-Ausdruck stehen die aufgefalteten Werte |
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304 der jeweiligen Zeile zur Verfügung. |
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305 |
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306 Folgends Beispiel soll dies verdeutlichen: |
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307 |
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308 +----+ |
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309 +Zahl+ |
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310 +====+ |
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311 + 1+ |
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312 +----+ |
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313 + 2+ |
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314 +----+ |
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315 + 3+ |
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316 +----+ |
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317 + 4+ |
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318 +----+ |
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319 |
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320 Zahlen erhalten, die einen Wert kleiner drei haben. |
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321 |
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322 .. code:: xml |
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323 |
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324 <dc:filter expr="$Zahl < 3"> |
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325 ... |
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326 <dc:filter> |
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327 |
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328 Dies erzeugt folgenden neuen Datensatz: |
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329 |
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330 +----+ |
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331 +Zahl+ |
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332 +====+ |
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333 + 1+ |
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334 +----+ |
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335 + 2+ |
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336 +----+ |
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337 |
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338 Innerhalb des `dc:filter`-Elementes kann der neue Datensatz wie gewohnt mit `dc:for-each` |
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339 realisiert werden. Nach Verlassen des `dc:filter`-Elementes ist wieder der vormalige |
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340 Datensatz aktuell. |
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341 |
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342 .. _dc:group: |
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343 |
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344 ``dc:group`` Datensätze in Gruppen ordnen |
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345 .......................................... |
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346 |
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347 .. code:: xml |
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348 |
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349 <dc:group expr="XPath-Ausdruck"> |
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350 ... |
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351 </dc:group> |
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352 |
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353 Pro Zeile des Originaldatensatzes wird der XPath-Ausdruck 'expr' ausgewertet. |
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354 Wie bei `dc:filter` stehen hier die aufgefalteten Werte der einzelnen Spalten zur |
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355 Verfügung. Das Resultat der XPath-Auswertung wird als Schlüssel für zu erzeugende |
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356 Gruppen benutzt, denen dann die Zeilen zugeordnet werden. |
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357 Nachdem alle Zeilen ihren entsprechenden Gruppen zugeordnet wurden, wir der |
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358 Inhalt des `dc:group`-Elements für jede Gruppe durchlaufen. Innerhalb des |
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359 `dc:group`-Elementes steht der jeweilige Schlüssel der aktuellen Gruppe über |
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360 die Funktion `dc:group-key()` zur Auswertung zu Verfügung. Innerhalb der |
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361 jeweiligen Gruppen kann mittels `dc:for-each` der jeweilige Unterdatensatz |
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362 realisiert werden. |
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363 |
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364 Zur Verdeutlichung folgendes Beispiel: |
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365 |
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366 +-------+-----------+ |
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367 +Marke +Bezeichnung+ |
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368 +=======+===========+ |
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369 +Ferrari+Testarossa + |
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370 +-------+-----------+ |
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371 +Volvo +V40 + |
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372 +-------+-----------+ |
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373 +Volvo +780 + |
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374 +-------+-----------+ |
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375 +Ferrari+F40 + |
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376 +-------+-----------+ |
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377 +VW +Käfer + |
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378 +-------+-----------+ |
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379 |
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380 .. code:: xml |
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381 |
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382 <marken> |
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383 <dc:group expr="$Marke"> |
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384 <marke name="{dc:group-key()}"> |
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385 <dc:for-each> |
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386 <bezeichnung name="$Bezeichnung"/> |
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387 </dc:for-each> |
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388 </marke> |
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389 </dc:group> |
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390 </marken> |
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391 |
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392 Dies führt zu folgender Ausgabe: |
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393 |
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394 .. code:: xml |
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395 |
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396 <marken> |
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397 <marke name="Ferrari"> |
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398 <bezeichnung name="F40"/> |
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399 <bezeichnung name="Testarossa"/> |
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400 </marke> |
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401 <marke name="Volvo"> |
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402 <bezeichnung name="V40"/> |
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403 <bezeichnung name="780"/> |
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404 </marke> |
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405 <marke name="VW"> |
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406 <bezeichnung name="Käfer"/> |
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407 </marke> |
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408 </marken> |
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409 |
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410 Der Expr-Ausdruck kann mittels der Zeichenfolge '#!#' innerhalb des Ausdrucks |
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411 in mehrere Ausdrücke zerlegt werden. Damit ist es möglich, einen Wert |
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412 in mehrere Kategorien einzusortieren. Wird z.B. ein Film über den Zeitraum |
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413 von zwei Jahren gedreht und man möchte eine Liste von Filmen nach ihren |
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414 Produktionsjahren gruppieren, sollte der Film im Resulat in beiden Jahren auftauchen. |
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415 |
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416 .. code:: xml |
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417 |
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418 <dc:group expr="$start_jahr #!# $end_jahr"> |
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419 |
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420 Datensätze auffalten |
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421 ~~~~~~~~~~~~~~~~~~~~ |
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422 |
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423 ``dc:for-each`` Realisieren eines Datensatzes |
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424 ............................................. |
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425 |
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426 .. code:: xml |
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427 |
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428 <dc:for-each> |
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|
429 ... |
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Datacage ref doc: Explain dc:for-each
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|
430 <dc:for-each> |
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Datacage ref doc: Explain dc:for-each
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|
431 |
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Datacage ref doc: Explain dc:for-each
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|
432 Erzeugt nacheinander alle zeilenweisen Realisationen des aktuellen Datensatzes. Die |
d29a5e703cc4
Datacage ref doc: Explain dc:for-each
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433 einzelnen Spaltenwerte sind dann über Variablen erreichbar, die nach den Spaltenbezeichnern |
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Datacage ref doc: Explain dc:for-each
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|
434 des Datenstzes benannt sind. |
d29a5e703cc4
Datacage ref doc: Explain dc:for-each
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|
435 |
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Datacage ref doc: Explain dc:for-each
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|
436 Folgendes Beispiel soll den Sachverhalt illustieren: |
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Datacage ref doc: Explain dc:for-each
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437 |
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Datacage ref doc: Explain dc:for-each
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|
438 +----+ |
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Datacage ref doc: Explain dc:for-each
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|
439 +Zahl+ |
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Datacage ref doc: Explain dc:for-each
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|
440 +====+ |
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Datacage ref doc: Explain dc:for-each
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|
441 + 1+ |
d29a5e703cc4
Datacage ref doc: Explain dc:for-each
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|
442 +----+ |
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Datacage ref doc: Explain dc:for-each
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|
443 + 2+ |
d29a5e703cc4
Datacage ref doc: Explain dc:for-each
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|
444 +----+ |
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Datacage ref doc: Explain dc:for-each
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|
445 + 3+ |
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Datacage ref doc: Explain dc:for-each
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|
446 +----+ |
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Datacage ref doc: Explain dc:for-each
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|
447 |
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Datacage ref doc: Explain dc:for-each
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448 .. code:: xml |
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Datacage ref doc: Explain dc:for-each
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|
449 |
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Datacage ref doc: Explain dc:for-each
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|
450 <zahlen> |
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Datacage ref doc: Explain dc:for-each
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|
451 <dc:for-each> |
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452 <zahl wert="$Zahl"/> |
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453 <dc:for-each> |
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Datacage ref doc: Explain dc:for-each
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454 </zahlen> |
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Datacage ref doc: Explain dc:for-each
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|
455 |
d29a5e703cc4
Datacage ref doc: Explain dc:for-each
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|
456 Dies erzeugt folgende Ausgabe: |
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Datacage ref doc: Explain dc:for-each
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457 |
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|
458 .. code:: xml |
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Datacage ref doc: Explain dc:for-each
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|
459 |
d29a5e703cc4
Datacage ref doc: Explain dc:for-each
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|
460 <zahlen> |
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Datacage ref doc: Explain dc:for-each
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461 <zahl wert="1"/> |
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Datacage ref doc: Explain dc:for-each
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462 <zahl wert="2"/> |
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463 <zahl wert="3"/> |
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|
464 </zahlen> |
7255
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First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
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465 |
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First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
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|
466 ``dc:iterate`` **TODO** |
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First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
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467 |
7320
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468 Bedingte Ausführung |
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Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
469 ~~~~~~~~~~~~~~~~~~~ |
22c85b8232cc
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470 |
22c85b8232cc
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471 ``<dc:if>`` Einfaches Wenn-Dann ohne Sonst-Fall |
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Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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472 ............................................... |
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Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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473 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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474 .. code:: xml |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
475 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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476 <dc:if test="XPath-Ausdruck"> |
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Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
477 ... |
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Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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478 </dc:if> |
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Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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479 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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480 Der innere Teil wird nur dann betreten, wenn der XPath-Ausdruck zu |
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481 logisch wahr evaluiert wird. Dieses Konstrukt kennt keinen alternativen |
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482 Pfad, der betreten wird, falls der Ausdruck zu logisch falsch ausgewertet |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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483 wird. Wird dies benötigt, muss man ``<dc:choose>`` benutzen. |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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484 ``<dc:if>`` ist in Symmetrie zu ``<xsl:if>`` von XSLT entworfen worden. |
22c85b8232cc
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parents:
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|
485 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
486 ``<dc:choose>`` Ketten von Wenn-Dann-Ausdrücken |
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Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
487 ............................................... |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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parents:
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changeset
|
488 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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parents:
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|
489 .. code:: xml |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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parents:
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|
490 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
491 <dc:choose> |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
492 <dc:when test="XPath-Ausdruck 1"> ... </dc:when> |
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|
493 <dc:when test="XPath-Ausdruck 2"> ... </dc:when> |
22c85b8232cc
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parents:
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|
494 ... |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
495 <dc:otherwise> ... </dc:otherwise> |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
496 </dc:choose> |
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|
497 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
498 Es werden der Reihe nach von oben nach unter die ``test``-XPath-Ausdrücke der ``dc:when``-Elemente ausgewertet. Evaluiert ein Ausdruck zu logisch wahr, wird der innere Teil des entsprechenden ``<dc:when>``-Elements betreten. Die verbliebenen |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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499 ``<dc:when>``- und ``<dc:otherwise>``-Elemente werden dann ignoriert. Evaluiert |
22c85b8232cc
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parents:
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|
500 keiner der ``test``-Ausdrücke zu wahr, wird der innere Teil des |
22c85b8232cc
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|
501 ``<dc:otherwise>``-Elements betreten. |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
502 ``<dc:choose>`` ist in Symmetrie zu ``<xsl:choose>`` von XSLT entworfen worden. |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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parents:
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|
503 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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|
504 |
22c85b8232cc
Datacage ref doc: Move dc:if & dc:choose up because they are more important than other elements.
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parents:
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|
505 |
7314
53d1dd441867
Datacage ref doc: More structure. Explain text interpolation.
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|
506 Makros |
53d1dd441867
Datacage ref doc: More structure. Explain text interpolation.
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|
507 ~~~~~~ |
7317
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
508 Um innerhalb des Definitionsdokumentes Wiederholungen zu vermeiden, können sogenannte |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
509 Makros definiert werden, die dann von anderer Stellen aus eingefügt werden können. |
7255
5783bd29de8a
First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
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parents:
diff
changeset
|
510 |
7317
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
511 ``dc:macro`` Wiederverwendbare Teile definieren |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
512 ............................................... |
7255
5783bd29de8a
First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
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parents:
diff
changeset
|
513 |
7317
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
514 .. code:: xml |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
515 |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
516 <dc:macro name="Name"> |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
517 ... |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
518 </dc:macro> |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
519 |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
520 Definiert ein Makro namens Name. Nach der Definition ist dieses dann unter diesem |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
521 Namen global innerhalb des Definitionsdokumentes bekannt. Makros können geschachtelt |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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522 werden. Auch eingeschachtelte Makros sind global sichtbar. Die Makrodefinition und |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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523 ihre eingeschalteten Elemente werden nicht in das Ausgabedokument übernommen. |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
524 |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
525 ``dc:call-macro`` Makros aufrufen |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
526 |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
527 .. code:: xml |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
528 |
00b17e77c2e8
Datacage ref doc: Explain dc:macro & Co.
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|
529 <dc:call-macro name="Name"> |
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530 |
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531 Ruft ein Makro names Name auf. Dieses muss mit `dc:macro` definiert sein. Die Reihenfolge |
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532 von Definition und Aufruf ist egal. |
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533 |
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534 ``dc:macro-body`` Elemente an ein Makro übergeben |
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535 ................................................. |
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536 |
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537 .. code:: xml |
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538 |
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539 <dc:macro name="Name"> |
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540 ... |
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541 <dc:macro-body/> |
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542 ... |
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543 </dc:macro> |
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544 |
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545 Um an Makros weitere Bausteine als Argument übergeben zu können, ist es optional |
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546 möglich innerhalb einer Makrodefinition ein Element `dc:macro-body` einzufügen. |
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547 Dieses Element expandiert sich zum Inhalt des `dc:call-macro`-Aufrufs. |
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548 |
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549 .. code:: xml |
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550 |
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551 <dc:call-macro name="Name">Inhalt von dc:macro-body</dc:call-macro> |
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552 |
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553 Zur Verdeutlichung ein konkretes Beispiel |
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554 |
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555 .. code:: xml |
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556 |
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557 <dc:macro name="Greetings"> |
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558 <Hallo> |
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559 <dc:macro-body/> |
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560 </Hallo> |
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561 </dc:macro> |
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562 |
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563 <dc:call-macro name="Greetings">Welt</dc:call-macro> |
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564 <dc:call-macro name="Greetings">Mond</dc:call-macro> |
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565 |
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566 Dies produziert folgende Ausgabe |
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567 |
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568 .. code:: xml |
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569 |
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570 <Hallo>Welt</Hallo> |
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571 <Hallo>Mond</Hallo> |
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572 |
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573 Das Haupteinsatzgebiet dieses Konstruktes ist die transparente Bereitstellung |
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574 von Kontexten, die dann verschiedentlich ausgewertet werden sollen. |
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575 |
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576 Sonstige Elemente |
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577 ~~~~~~~~~~~~~~~~~ |
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578 |
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579 ``dc:element`` Hinzufügen neuer Elemente in der Ausgabe |
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580 ....................................................... |
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581 |
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582 .. code:: xml |
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583 |
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584 <dc:element name="Name"> |
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585 ... |
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586 </dc:element> |
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587 |
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588 Erzeugt ein Element namens Name. Für den Namen gelten die `${}-Ersetzungen`_. |
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589 |
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590 |
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591 ``dc:attribute`` Hinzufügen neuer Attribute zum umgebenden Ausgabeelement |
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592 ......................................................................... |
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593 |
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594 .. code:: xml |
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|
595 |
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|
596 <dc:attribute name="Name" value="Wert"/> |
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|
597 |
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598 Fügt dem umgebenden Ausgabeelement ein weiteres Attribut namens Name mit dem |
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599 Wert von Wert hinzu. Für Namen und Wert gelten die `${}-Ersetzungen`_. |
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600 Der Einsatz dieses Konstrukts findet häufig im Zusammenhang mit dc:element |
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601 seinen Einsatz, wenn es ein Ausgabeelement vollständig aus Variablenbelegungen |
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|
602 erstellt werden soll. |
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|
603 |
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|
604 ``dc:comment`` Kommentare im Beschreibungsdokument |
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|
605 .................................................. |
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|
606 |
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|
607 .. code:: xml |
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|
608 |
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609 <dc:comment> |
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610 ... |
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|
611 </dc:comment> |
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612 |
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613 Ein Kommentar auf Ebene des Beschreibungsdokumentes, das keinerlei Ausgabe |
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614 im Ausgabedokument erzeugt. Eingeschachtelte Elemente werden ebenfalls nicht ausgewertet. |
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615 Im Gegensatz dazu werden die XML-typischen **<!-- Kommetare -->** in das Ausgabedokument übernommen! |
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|
616 |
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617 |
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618 ``dc:message`` Ausgabe auf die Diagnoseausgabe (Log) |
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619 .................................................... |
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620 |
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621 .. code:: xml |
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622 |
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623 <dc:message> |
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624 Text für die Diagnose. |
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625 </dc:message> |
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626 |
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627 Gibt den Text innerhalb des Elementes aus Ausgabe im Log aus. Dies dient in erster Linie |
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628 dem Nachvollziehen von Aufrufen innerhalb des Datenkorbdokumentes. Für den Text gelten |
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629 die `{$}-Ersetzungen`_. |
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|
630 |
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631 ``dc:variable`` Erzeugung einer kontext-lokalen Variablen |
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632 ......................................................... |
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633 |
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634 .. code:: xml |
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635 |
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636 <dc:variable name="Name" type="Typ" expr="XPath-Ausdruck"/> |
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|
637 |
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638 Legt im aktuellen Kontext eine lokale Variable namens Name an. Diese hat den |
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639 Typ Typ und entsteht durch Auswertung des XPath-Ausdruck expr. Der Typ |
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640 ist optional. Wird dieser nicht gesetzt, wird das Ergebnis als String interpretiert. |
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641 Alternativ können hier die Werte 'number' für Zahlen, 'bool' für Boolean-Werte |
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|
642 benutzt werden. Für den Namen und den Typ gelten die `${}-Ersetzungen`_. |
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643 Wird der aktuellen `dc:context` verlassen, ist diese Variable nicht mehr definiert. |
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|
644 |
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|
645 |
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646 ``dc:convert`` kontext-lokale Konvertierung von Variablen |
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647 ......................................................... |
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648 |
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649 .. code:: xml |
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650 |
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651 <dc:convert name="Name" type="Typ"/> |
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652 |
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|
653 Konvertiert die Variable namens Name für die Gültigkeit des aktuellen Kontextes in |
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654 einen anderen Typ. Für Name und Typ gelten die `${}-Ersetzungen`_. Für die |
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655 Typen gilt das gleiche wie für die Typen von `dc:variable`. |
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656 |
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657 |
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658 Datenkorb-Funktionen |
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659 -------------------- |
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660 |
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661 ``dc:has-result`` Prüfen, ob der aktuelle Datensatz nicht leer ist |
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662 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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663 |
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664 ``dc:has-result()`` liefert logisch wahr zurück, falls der aktuelle |
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665 Datensatz nicht leer ist, sprich Datenzeilen enthält. Ansonsten wird |
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666 logisch falsch zurück gegeben. Mittels dieser Funktion können leere |
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667 Knoten im Resultatdokument verhindert werden. Die typische Nutzung |
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668 ist daher innerhalb des ``test``-Attributs eines ``<dc:if>``-Elements. |
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669 |
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670 ``dc:contains`` Prüfen, ob Suchbegriff in einer Liste vorhanden ist |
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671 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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672 |
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673 ``dc:contains(Heuhaufen, Nadel)`` prüft ob das Suchobjekt Nadel in |
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674 der Liste Heufhaufen zu finden ist. Liefert logisch wahr falls die |
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675 Nadel gefunden wurde, ansonsten logisch falsch. Typischer Anwendungsfall: |
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676 ``dc:contains($outs, 'longitudinal-section')`` prüft, ob in der Liste |
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677 der aktuellen Outs der Eintrag 'longitudinal-section' zu finden ist. |
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678 |
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679 ``dc:replace`` Textersatz in Strings |
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680 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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681 |
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682 ``dc:replace(Heuhaufen, Nadel, Ersatz)`` ersetzt in im String Heuhaufen alle |
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683 Vorkommen des Strings Nadel durch den String Ersatz. ``dc:replace('Banane', 'a', 'e')`` |
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684 resultiert folglich in dem String ``Benene``. |
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685 |
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686 ``dc:replace-all`` Textersatz in Strings mit regulären Ausdrücken |
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687 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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688 |
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689 ``dc:replace-all(Heuhaufen, Nadel, Ersatz)`` ersetzt in im String Heuhaufen alle |
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690 Vorkommen des regulären Ausdrucks durch den String Ersatz. Auf im regulären Ausdruck |
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691 gebildete Gruppen ``()`` kann mit ``$1``, ``$2``, ``$3`` usw. im Ersatztext zurückgegriffen werden. |
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692 ``dc:replace-all('KlausGabiPeter', '(Klaus|Peter)', '>$1<')`` resultiert demnach |
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|
693 in ``>Klaus<Gabi>Peter<``. |
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|
694 |
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695 ``dc:find-all`` Extraktion von Strings aus einem String anhand eines regulären Ausdrucks |
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696 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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|
697 |
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698 ``dc:find-all(Nadel, Heuhaufen)`` extrahiert aus einem String Heuhaufen all jene Substrings, |
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699 die auf den regulären Ausdruck Nadel passen. Das Resultat dieser Funktion ist eine Liste |
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700 von Strings. Sie ist leer, wenn das Muster nicht gefunden wurde. |
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|
701 |
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702 ``dc:find-all('\d{4}', '1900 1930 1941 1960')`` liefert dem entsprechend die Liste |
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703 ``'1900'``, ``'1930'``, ``'1941'``, ``'1960'``. |
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704 |
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705 ``dc:date-format`` Formatierte Ausgabe eines Datums |
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706 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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707 |
7907
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Fixed typos in datacage manual.
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|
708 ``dc:date-format(Format, Datum)`` liefert für ein Datum einen String, der |
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709 nach den Formatierungsregeln aus Format formatiert wird. Für die Formatierungen |
8460
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710 gelten die in SimpleFormat_ beschriebenen Regeln. ``Datum`` kann dabei ein |
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711 Datums-Objekt oder eine Zahl sein. Letztere wird als Millisekunden nach dem |
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712 1.1.1970 00:00:00 GMT interpretiert. |
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713 |
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714 .. _SimpleFormat: http://docs.oracle.com/javase/6/docs/api/java/text/SimpleDateFormat.html |
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|
715 |
8119
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Format timestamps in datacage tooltip for porosities.
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|
716 ``dc:date-format('dd.MM.yyyy', $datum)`` liefert für ein ``$datum`` |
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717 mit dem Wert 1. Dezember 1941 den String ``01.12.1941``. |
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718 |
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|
719 |
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720 ``dc:group-key`` Wert des aktuellen Gruppierungsschlüssels |
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721 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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722 |
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|
723 Siehe hierzu `dc:group`_. |
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|
724 |
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|
725 ``dc:dump-variables`` Aktuelle Variablenbelegung als String |
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726 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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|
727 |
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|
728 ``dc:dump-variables()`` liefert einen String mit der aktuellen Belegung aller Variablen. |
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729 Dies ist zusammen mit ``dc:message`` nützlich, um eine Ablaufverfolgung zu implementieren. |
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730 |
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731 ``dc:get`` Dynamische Variablenauswertung |
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732 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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|
733 |
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734 ``dc:get(Variablenname)`` ermöglicht es, eine Variable über ihren Namen als String |
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|
735 auszuwerten. Gegenüber der normalen XPath-Variablenauswertung kann die Variable auch |
f5948a07f317
Datacage ref doc: More docs for functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7410
diff
changeset
|
736 null liefern. Bis auf diese Ausnahme ist der Aufruf ``dc:get('a')`` identisch zu ``$a`` |
f5948a07f317
Datacage ref doc: More docs for functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7410
diff
changeset
|
737 in XPath-Kontexten. |
7255
5783bd29de8a
First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
738 |
7416
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
739 ``dc:max-number`` Bestimmung des Maximums einer Liste von Zahlen |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
740 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
7255
5783bd29de8a
First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
741 |
7416
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
742 ``dc:max-number($liste)`` Ermittelt aus einer Liste von Zahlen das Maximum. Strings werden dabei in Zahlen umgewandelt. |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
743 |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
744 ``dc:max-number(dc:find-all('\d{4}', '1900 1930 1941 1960'))`` liefert also ``1960``. |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
745 |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
746 |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
747 ``dc:min-number`` Bestimmung des Minimums einer Liste von Zahlen |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
748 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
749 |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
750 ``dc:min-number($liste)`` Ermittelt aus einer Liste von Zahlen das Minimum. Strings werden dabei in Zahlen umgewandelt. |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
751 |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
752 ``dc:min-number(dc:find-all('\d{4}', '1900 1930 1941 1960'))`` liefert also ``1960``. |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
753 |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
754 |
f26e7d386d8c
Datacage ref doc: More docs on functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7415
diff
changeset
|
755 |
7255
5783bd29de8a
First draft of a german reference document for datacage elements and functions written in reStructuredText. Lots of TODOs.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
diff
changeset
|
756 |
7415
f5948a07f317
Datacage ref doc: More docs for functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7410
diff
changeset
|
757 ``dc:fromValue`` **TODO** |
7400
dd87e0a5f83c
Datacage: Added TODOs for new functions in ref document.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7379
diff
changeset
|
758 |
7415
f5948a07f317
Datacage ref doc: More docs for functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7410
diff
changeset
|
759 ``dc:toValue`` **TODO** |
f5948a07f317
Datacage ref doc: More docs for functions.
Sascha L. Teichmann <teichmann@intevation.de>
parents:
7410
diff
changeset
|
760 |
8306
33d90858b2dc
Remove duplications from discharge prototypes and put it all together.
"Tom Gottfried <tom@intevation.de>"
parents:
8119
diff
changeset
|
761 ``dc:coalesce`` **TODO** |
33d90858b2dc
Remove duplications from discharge prototypes and put it all together.
"Tom Gottfried <tom@intevation.de>"
parents:
8119
diff
changeset
|
762 |