Mercurial > dive4elements > river
annotate artifacts/doc/datacage_ref_de.rst @ 7351:2d912b2a4bdf double-precision
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author | Sascha L. Teichmann <teichmann@intevation.de> |
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date | Wed, 16 Oct 2013 12:57:40 +0200 |
parents | 7be4425eaca9 |
children | e07dc8854a8f |
rev | line source |
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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 Daten |
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12 ----- |
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13 Im Datenkorb stehen zwei Arten von Daten zur Auswertung zur Verfügung. |
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14 |
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15 ``Datensätze`` |
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16 ~~~~~~~~~~~~~~ |
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17 Datensätze sind Tabellen mit benannten Spalten. Sie werden von Datenquellen |
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18 erzeugt und in einem Stapel verwaltet. Die konkreten Werte stehen erst durch |
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19 Auffaltung als Variablen zur Verfügung. |
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20 |
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21 |
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22 ``Variablen`` |
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23 ~~~~~~~~~~~~~ |
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24 Variablen sind die Werte, die aktuell zur Auswertung zur Verfügung stehen. Sie haben |
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25 einen Namen und einen Typ (String, Zahl, durch Datenquelle bestimmt). |
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26 |
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27 Textersatz |
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28 ---------- |
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29 Um die Wertebelegungen in das Ausgabedokument schreiben zu kann an entsprechenden |
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30 Stellen eine String-Interpolation durchgeführt werden. |
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31 Hier finden zwei Arten von Textersatz ihren Einsatz. |
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32 |
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33 ``${}-Ersetzungen`` |
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34 ~~~~~~~~~~~~~~~~~~~ |
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35 Die ältere Variante. Innerhalb von Strings werden hier nur Variablen aufgelöst. |
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36 Beispiel: "**Hallo, ${planet}!**" wird bei planet = 'Welt' zu "**Hallo, Welt!**". |
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37 |
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38 ``{$}-Ersetzungen`` |
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39 ~~~~~~~~~~~~~~~~~~~ |
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40 Die neuere Variante, allerdings noch nicht komplett an allen Stellen einsatzfähig. |
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41 Innerhalb der geschweiften Klammern können beliebige XPath-Ausdrück stehen, die |
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42 zu Strings evaluiert werden. Dies orientiert sich an den String-Auswertungen in XSLT. |
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43 "**{ concat($greet, ', ', $planet, '!') }**" wird bei gesetzten Variablen greet = Hallo |
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44 und planet = "Welt" zu **Hallo, Welt!** ausgewertet. |
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45 |
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46 Datenkorb-Elemente |
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47 ------------------ |
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48 |
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49 Datensätze erzeugen |
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50 ~~~~~~~~~~~~~~~~~~~ |
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51 |
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52 ``dc:context`` Aufspannen eines Gültigkeitsbereiches eines Datenbankdatensatz |
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53 ............................................................................. |
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54 |
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55 .. code:: xml |
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56 |
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57 <dc:context connection="Verbindung"> |
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58 ... |
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59 </dc:element> |
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60 |
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61 Spannt einen Gültigkeitsbereich für einen Datensatz auf, der aus der Datenbank |
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62 kommt. Die adressierte Datenbank wird über das optionale Attribut 'connection' |
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63 bestimmt. Zur Zeit sind drei Datenbanken angebunden: |
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64 |
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65 - **user**: Die Index-Datenbank des Artefakt-Servers. Hierüber stehen Meta-Informationen |
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66 zu alten Berechnungen zur Verfügung. |
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67 |
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68 - **system**: Die FLYS-Datenbank mit den hydrologischen, morphologische und geodätischen |
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69 Daten. |
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70 |
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71 - **seddb**: Die Sediment-Datenbank. |
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72 |
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73 In einem `<dc:context>`-Element wird zwingend ein `<dc:statement>`-Element erwartet, |
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74 um einen Datensatz aus der Datenbank zu holen. Dieser Datensatz steht dann innerhalb des |
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75 `<dc:context>`-Elementes ein oder mehrfach zur Verfügung. Innerhalb eines |
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76 `<dc:context>`-Elementes können weitere `<dc:context>`-Elemente eingeschachtelt werden. |
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77 Ist kein 'connection'-Attribut vorhanden, wird die Datenbank-Verbindung des umgebenen |
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78 Kontextes weiterbenutzt. Initial wird je nach Aufrufart der Datenkorbs entweder |
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79 der **user** oder **system**-Kontext angenommen. Dies richtet sich danach, ob in |
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80 der Aufrufumgebung eine Artefakt gesetzt wird oder nicht. Im ersten Fall wird |
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81 angenommen, dass es sich um einen Ladevorgang für zusätzliche Daten handelt, die |
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82 auch alte Berechnungen mit einschliesst. |
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83 |
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84 |
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85 ``dc:statement`` Holen eines Datensatzes aus einer Datenbank |
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86 ............................................................ |
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87 |
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88 .. code:: xml |
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89 |
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90 <dc:statement> |
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91 SQL-Select-Statement. |
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92 </dc:element> |
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93 |
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94 Mittels eines SQL-Select-Statements werden in einem `<dc:context>`-Elementes aus |
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95 der dort definierten Datenbank geholt. Die Spaltennamen der Projektion des SQL-Statements |
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96 werden übernommen und später beim Auffalten des Datensatzes benutzt. |
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97 |
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98 ``dc:container-context`` **TODO** |
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99 |
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100 ``dc:properties`` **TODO** |
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101 |
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102 ``dc:virtual-column`` Virtuelle Spalten definieren |
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103 .................................................. |
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104 |
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105 .. code:: xml |
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106 |
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107 <dc:virtual-column name="Name" type="Type" expr="XPath-Ausdruck"> |
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108 ... |
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109 </dc:virtual-column> |
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110 |
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111 Definiert eine neue, virtuelle Spalte namens Name für den aktuellen Datensatz. |
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112 Der Typ wird optional durch Typ festgelegt; ohne Angabe wird der Typ String angenommen. |
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113 Die Wertebelegung ergibt sich aus der zeilenweisen Auswertung des XPath-Ausdrucks. |
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114 |
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115 Dies sei an folgendem Beispiel illustriert: |
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116 |
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117 +----+ |
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118 +Zahl+ |
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119 +====+ |
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120 + 1+ |
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121 +----+ |
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122 + 2+ |
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123 +----+ |
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124 + 3+ |
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125 +----+ |
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126 |
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127 .. code:: xml |
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128 |
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129 <dc:virtual-column name="Quadrat" type="number" expr="$Zahl * $Zahl"> |
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130 ... |
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131 </dc:virtual-column> |
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132 |
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133 Erzeugt einen neuen Datensatz folgender Struktur: |
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134 |
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135 +----+-------+ |
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136 +Zahl+Quadrat+ |
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137 +====+=======+ |
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138 + 1+ 1+ |
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139 +----+-------+ |
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140 + 2+ 4+ |
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141 +----+-------+ |
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142 + 3+ 9+ |
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143 +----+-------+ |
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144 |
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145 Innerhalb eines `virtual-column`-Elementes kann der Datensatz mittel `dc:for-each` wie |
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146 gewohnt realisiert werden. Wird das `dc:virtual-column`-Element verlassen, gilt wieder |
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147 der vormalige Datensatz ohne die zusätzlich Spalte. |
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148 |
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149 Datensätze einschränken |
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150 ~~~~~~~~~~~~~~~~~~~~~~~ |
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151 |
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152 ``dc:filter`` Selektieren einzelner Zeilen aus dem aktuellen Datensatz |
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153 ...................................................................... |
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154 |
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155 .. code:: xml |
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156 |
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157 <dc:filter expr="XPath-Ausdruck"> |
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158 ... |
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159 </dc:filter> |
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160 |
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161 Evaluiert pro Zeile des aktuellen Datensatzes den XPath-Ausdruck 'expr' und erzeugt |
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162 einen neuen Datensatz, der nur die Zeilen des Originaldatensatzes enthält für den |
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163 die Auswertung logisch wahr ergab. Im XPath-Ausdruck stehen die aufgefalteten Werte |
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164 der jeweiligen Zeile zur Verfügung. |
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165 |
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166 Folgends Beispiel soll dies verdeutlichen: |
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167 |
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168 +----+ |
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169 +Zahl+ |
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170 +====+ |
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171 + 1+ |
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172 +----+ |
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173 + 2+ |
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174 +----+ |
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175 + 3+ |
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176 +----+ |
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177 + 4+ |
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178 +----+ |
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179 |
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180 Zahlen erhalten, die einen Wert kleiner drei haben. |
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181 |
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182 .. code:: xml |
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183 |
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184 <dc:filter expr="$Zahl < 3"> |
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185 ... |
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186 <dc:filter> |
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187 |
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188 Dies erzeugt folgenden neuen Datensatz: |
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189 |
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190 +----+ |
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191 +Zahl+ |
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192 +====+ |
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193 + 1+ |
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194 +----+ |
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195 + 2+ |
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196 +----+ |
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197 |
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198 Innerhalb des `dc:filter`-Elementes kann der neue Datensatz wie gewohnt mit `dc:for-each` |
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199 realisiert werden. Nach Verlassen des `dc:filter`-Elementes ist wieder der vormalige |
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200 Datensatz aktuell. |
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201 |
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202 ``dc:group`` Datensätzen in Gruppen ordnen |
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203 .......................................... |
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204 |
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205 .. code:: xml |
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206 |
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207 <dc:group expr="XPath-Ausdruck"> |
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208 ... |
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209 </dc:group> |
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210 |
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211 Pro Zeile der Originaldatensatzes wird der XPath-Ausdruck 'expr' ausgewertet. |
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212 Wie bei `dc:filter` stehen hier die aufgefalteten Werte der einzelnen Spalten zur |
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213 Verfügung. Das Resultat der XPath-Auswertung wird als Schlüssel für zu erzeugende |
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214 Gruppen benutzt, denen dann die Zeilen zugeordnet werden. |
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215 Nachdem alle Zeilen ihren entsprechenden Gruppen zugeordnet wurden, wir der |
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216 Inhalt des `dc:group`-Elements für jede Gruppe durchlaufen. Innerhalb des |
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217 `dc:group`-Elementes steht der jeweilige Schlüssel der aktuellen Gruppe über |
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218 die Funktion `dc:group-key()` zur Auswertung zu Verfügung. Innerhalb der |
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219 jeweiligen Gruppen kann mittel `dc:for-each` der jeweilige Unterdatensatz |
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220 realisiert werden. |
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221 |
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222 Zur Verdeutlichung folgendes Beispiel: |
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223 |
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224 +-------+-----------+ |
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225 +Marke +Bezeichnung+ |
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226 +=======+===========+ |
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227 +Ferrari+Testarossa + |
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228 +-------+-----------+ |
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229 +Volvo +V40 + |
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230 +-------+-----------+ |
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231 +Volvo +780 + |
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232 +-------+-----------+ |
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233 +Ferrari+F40 + |
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234 +-------+-----------+ |
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235 +VW +Käfer + |
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236 +-------+-----------+ |
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237 |
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238 .. code:: xml |
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239 |
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240 <marken> |
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241 <dc:group expr="$Marke"> |
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242 <marke name="{dc:group-key()}"> |
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243 <dc:for-each> |
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244 <bezeichnung name="$Bezeichnung"/> |
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245 </dc:for-each> |
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246 </marke> |
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247 </dc:group> |
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248 </marken> |
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249 |
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250 Dies führt zu folgender Ausgabe: |
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251 |
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252 .. code:: xml |
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253 |
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254 <marken> |
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255 <marke name="Ferrari"> |
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256 <bezeichnung name="F40"/> |
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257 <bezeichnung name="Testarossa"/> |
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258 </marke> |
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259 <marke name="Volvo"> |
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260 <bezeichnung name="V40"/> |
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261 <bezeichnung name="780"/> |
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262 </marke> |
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263 <marke name="VW"> |
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264 <bezeichnung name="Käfer"/> |
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265 </marke> |
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266 </marken> |
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267 |
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268 Datensätze auffalten |
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269 ~~~~~~~~~~~~~~~~~~~~ |
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270 |
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271 ``dc:for-each`` Realisieren eines Datensatzes |
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272 ............................................. |
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273 |
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274 .. code:: xml |
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275 |
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276 <dc:for-each> |
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277 ... |
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278 <dc:for-each> |
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279 |
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280 Erzeugt nacheinander alle zeilenweisen Realisationen des aktuellen Datensatzes. Die |
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281 einzelnen Spaltenwerte sind dann über Variablen erreichbar, die nach den Spaltenbezeichnern |
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282 des Datenstzes benannt sind. |
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283 |
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284 Folgendes Beispiel soll den Sachverhalt illustieren: |
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285 |
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286 +----+ |
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287 +Zahl+ |
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288 +====+ |
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289 + 1+ |
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290 +----+ |
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291 + 2+ |
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292 +----+ |
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293 + 3+ |
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294 +----+ |
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295 |
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296 .. code:: xml |
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297 |
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298 <zahlen> |
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299 <dc:for-each> |
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300 <zahl wert="$Zahl"/> |
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301 <dc:for-each> |
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302 </zahlen> |
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303 |
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304 Dies erzeugt folgende Ausgabe: |
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305 |
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306 .. code:: xml |
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307 |
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308 <zahlen> |
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309 <zahl wert="1"/> |
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310 <zahl wert="2"/> |
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311 <zahl wert="3"/> |
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312 </zahlen> |
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313 |
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314 ``dc:iterate`` **TODO** |
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315 |
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316 Bedingte Ausführung |
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317 ~~~~~~~~~~~~~~~~~~~ |
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318 |
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319 ``<dc:if>`` Einfaches Wenn-Dann ohne Sonst-Fall |
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320 ............................................... |
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321 |
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322 .. code:: xml |
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323 |
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324 <dc:if test="XPath-Ausdruck"> |
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325 ... |
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326 </dc:if> |
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327 |
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328 Der innere Teil wird nur dann betreten, wenn der XPath-Ausdruck zu |
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329 logisch wahr evaluiert wird. Dieses Konstrukt kennt keinen alternativen |
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330 Pfad, der betreten wird, falls der Ausdruck zu logisch falsch ausgewertet |
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331 wird. Wird dies benötigt, muss man ``<dc:choose>`` benutzen. |
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332 ``<dc:if>`` ist in Symmetrie zu ``<xsl:if>`` von XSLT entworfen worden. |
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333 |
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334 ``<dc:choose>`` Ketten von Wenn-Dann-Ausdrücken |
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335 ............................................... |
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336 |
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337 .. code:: xml |
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338 |
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339 <dc:choose> |
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340 <dc:when test="XPath-Ausdruck 1"> ... </dc:when> |
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341 <dc:when test="XPath-Ausdruck 2"> ... </dc:when> |
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342 ... |
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343 <dc:otherwise> ... </dc:otherwise> |
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344 </dc:choose> |
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345 |
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346 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 |
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347 ``<dc:when>``- und ``<dc:otherwise>``-Elemente werden dann ignoriert. Evaluiert |
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348 keiner der ``test``-Ausdrücke zu wahr, wird der innere Teil des |
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349 ``<dc:otherwise>``-Elements betreten. |
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350 ``<dc:choose>`` ist in Symmetrie zu ``<xsl:choose>`` von XSLT entworfen worden. |
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351 |
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352 |
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353 |
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354 Makros |
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355 ~~~~~~ |
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356 Um innerhalb des Definitionsdokumentes Wiederholungen zu vermeiden, können sogenannte |
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357 Makros definiert werden, die dann von anderer Stellen aus eingefügt werden können. |
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358 |
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359 ``dc:macro`` Wiederverwendbare Teile definieren |
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360 ............................................... |
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361 |
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362 .. code:: xml |
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363 |
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364 <dc:macro name="Name"> |
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365 ... |
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366 </dc:macro> |
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367 |
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368 Definiert ein Makro namens Name. Nach der Definition ist dieses dann unter diesem |
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369 Namen global innerhalb des Definitionsdokumentes bekannt. Makros können geschachtelt |
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370 werden. Auch eingeschachtelte Makros sind global sichtbar. Die Makrodefinition und |
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371 ihre eingeschalteten Elemente werden nicht in das Ausgabedokument übernommen. |
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372 |
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373 ``dc:call-macro`` Makros aufrufen |
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374 |
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375 .. code:: xml |
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376 |
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377 <dc:call-macro name="Name"> |
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378 |
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379 Ruft ein Makro names Name auf. Dieses muss mit `dc:macro` definiert sein. Die Reihenfolge |
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380 von Definition und Aufruf ist egal. |
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381 |
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382 ``dc:macro-body`` Elemente an ein Makro übergeben |
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383 ................................................. |
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384 |
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385 .. code:: xml |
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386 |
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387 <dc:macro name="Name"> |
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388 ... |
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389 <dc:macro-body/> |
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390 ... |
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391 </dc:macro> |
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392 |
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393 Um an Makros weitere Bausteine als Argument übergeben zu können, ist es optional |
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394 möglich innerhalb einer Makrodefinition ein Element `dc:macro-body` einzufügen. |
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395 Dieses Element expandiert sich zum Inhalt des `dc:call-macro`-Aufrufs. |
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396 |
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397 .. code:: xml |
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398 |
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399 <dc:call-macro name="Name">Inhalt von dc:macro-body</dc:call-macro> |
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400 |
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401 Zur Verdeutlichung ein konkretes Beispiel |
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402 |
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403 .. code:: xml |
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404 |
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405 <dc:macro name="Greetings"> |
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406 <Hallo> |
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407 <dc:macro-body/> |
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408 </Hallo> |
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409 </dc:macro> |
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410 |
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411 <dc:call-macro name="Greetings">Welt</dc:call-macro> |
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412 <dc:call-macro name="Greetings">Mond</dc:call-macro> |
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413 |
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414 Dies produziert folgende Ausgabe |
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415 |
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416 .. code:: xml |
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417 |
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418 <Hallo>Welt</Hallo> |
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419 <Hallo>Mond</Hallo> |
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420 |
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421 Das Haupteinsatzgebiet dieses Konstruktes ist die transparente Bereitstellung |
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422 von Kontexten, die dann verschiedentlich ausgewertet werden sollen. |
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423 |
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424 Sonstige Elemente |
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425 ~~~~~~~~~~~~~~~~~ |
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426 |
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427 ``dc:element`` Hinzufügen neuer Elemente in der Ausgabe |
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428 ....................................................... |
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429 |
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430 .. code:: xml |
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431 |
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432 <dc:element name="Name"> |
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433 ... |
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434 </dc:element> |
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435 |
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436 Erzeugt ein Element namens Name. Für den Namen gelten die `${}-Ersetzungen`_. |
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437 |
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438 |
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439 ``dc:attribute`` Hinzufügen neuer Attribute zum umgebenden Ausgabeelement |
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440 ......................................................................... |
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441 |
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442 .. code:: xml |
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443 |
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444 <dc:attribute name="Name" value="Wert"/> |
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445 |
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446 Fügt dem umgebenden Ausgabeelement ein weiteres Attribut namens Name mit dem |
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447 Wert von Wert hinzu. Für Namen und Wert gelten die `${}-Ersetzungen`_. |
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448 Der Einsatz dieses Konstrukts findet häufig im Zusammenhang mit dc:element |
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449 seinen Einsatz, wenn es ein Ausgabeelement vollständig aus Variablenbelegungen |
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450 erstellt werden soll. |
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451 |
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452 ``dc:comment`` Kommentare im Beschreibungsdokument |
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453 .................................................. |
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454 |
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455 .. code:: xml |
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456 |
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457 <dc:comment> |
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458 ... |
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459 </dc:comment> |
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460 |
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461 Ein Kommentar auf Ebene des Beschreibungsdokumentes, das keinerlei Ausgabe |
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462 im Ausgabedokument erzeugt. Eingeschachtelte Elemente werden ebenfalls nicht ausgewertet. |
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463 Im Gegensatz dazu werden die XML-typischen **<!-- Kommetare -->** in das Ausgabedokument übernommen! |
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464 |
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465 |
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466 ``dc:message`` Ausgabe auf die Diagnoseausgabe (Log) |
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467 .................................................... |
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468 |
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469 .. code:: xml |
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470 |
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471 <dc:message> |
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472 Text für die Diagnose. |
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473 </dc:message> |
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474 |
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475 Gibt den Text innerhalb des Elementes aus Ausgabe im Log aus. Dies dient in erster Linie |
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476 dem Nachvollziehen von Aufrufen innerhalb des Datenkorbdokumentes. Für den Text gelten |
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477 die `{$}-Ersetzungen`_. |
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478 |
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479 ``dc:variable`` Erzeugung einer kontext-lokalen Variablen |
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480 ......................................................... |
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481 |
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482 .. code:: xml |
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483 |
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484 <dc:variable name="Name" type="Typ" expr="XPath-Ausdruck"/> |
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485 |
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486 Legt im aktuellen Kontext eine lokale Variable namens Name an. Diese hat den |
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487 Typ Typ und entsteht durch Auswertung des XPath-Ausdruck expr. Der Typ |
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488 ist optional. Wird dieser nicht gesetzt, wird das Ergebnis als String interpretiert. |
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489 Alternativ können hier die Werte 'number' für Zahlen, 'bool' für Boolean-Werte |
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490 benutzt werden. Für den Namen und den Typ gelten die `${}-Ersetzungen`_. |
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491 Wird der aktuellen `dc:context` verlassen, ist diese Variable nicht mehr definiert. |
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492 |
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493 |
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494 ``dc:convert`` kontext-lokale Konvertierung von Variablen |
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495 ......................................................... |
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496 |
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497 .. code:: xml |
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498 |
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499 <dc:convert name="Name" type="Typ"/> |
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500 |
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501 Konvertiert die Variable namens Name für die Gültigkeit des aktuellen Kontextes in |
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502 einen anderen Typ. Für Name und Typ gelten die `${}-Ersetzungen`_. Für die |
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503 Typen gilt das gleiche wie für die Typen von `dc:variable`. |
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504 |
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505 |
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506 Datenkorb-Funktionen |
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507 -------------------- |
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508 |
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509 ``dc:contains`` **TODO** |
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510 |
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511 ``dc:fromValue`` **TODO** |
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512 |
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513 ``dc:toValue`` **TODO** |
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514 |
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515 ``dc:replace`` **TODO** |
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516 |
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517 ``dc:replace-all`` **TODO** |
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518 |
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519 ``dc:has-result`` **TODO** |
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520 |
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521 ``dc:group-key`` **TODO** |
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522 |
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523 ``dc:date-format`` **TODO** |
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changeset
|
524 |
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
|
525 ``dc:dump-variables`` **TODO** |
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
|
526 |
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
|
527 ``dc:get`` **TODO** |
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
|
528 |
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
|
529 |
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
|
530 |