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annotate artifacts/doc/datacage_ref_de.rst @ 7314:53d1dd441867

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Datacage ref doc: More structure. Explain text interpolation.
author Sascha L. Teichmann <teichmann@intevation.de>
date Mon, 14 Oct 2013 13:08:33 +0200
parents 5783bd29de8a
children 8498fdd71a1e
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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52 ``dc:context`` **TODO**
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53
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54 ``dc:statement`` **TODO**
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55
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56 ``dc:container-context`` **TODO**
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57
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58 ``dc:properties`` **TODO**
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59
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60 ``dc:virtual-column`` **TODO**
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61
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62 Datensätze einschränken
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63 ~~~~~~~~~~~~~~~~~~~~~~~
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64
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65 ``dc:filter`` **TODO**
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66
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67 ``dc:group`` **TODO**
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68
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69 Datensätze auffalten
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70 ~~~~~~~~~~~~~~~~~~~~
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71
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72 ``dc:for-each`` **TODO**
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73
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74 ``dc:iterate`` **TODO**
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75
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76 Makros
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77 ~~~~~~
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79 ``dc:macro`` **TODO**
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81 ``dc:macro-body`` **TODO**
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83 ``dc:call-macro`` **TODO**
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84
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85 Sonstige Elemente
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86 ~~~~~~~~~~~~~~~~~
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87
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88 ``dc:element`` Hinzufügen neuer Elemente in der Ausgabe
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89 .......................................................
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90
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91 .. code:: xml
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92
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93 <dc:element name="Name">
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94 ...
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95 </dc:element>
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96
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97 Erzeugt ein Element namens Name. Für den Namen gelten die `${}-Ersetzungen`_.
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98
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99
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100 ``dc:attribute`` Hinzufügen neuer Attribute zum umgebenden Ausgabeelement
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101 .........................................................................
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102
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103 .. code:: xml
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104
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105 <dc:attribute name="Name" value="Wert"/>
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106
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107 Fügt dem umgebenden Ausgabeelement ein weiteres Attribut namens Name mit dem
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108 Wert von Wert hinzu. Für Namen und Wert gelten die `${}-Ersetzungen`_.
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109 Der Einsatz dieses Konstrukts findet häufig im Zusammenhang mit dc:element
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110 seinen Einsatz, wenn es ein Ausgabeelement vollständig aus Variablenbelegungen
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111 erstellt werden soll.
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112
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115
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116 ``dc:comment`` **TODO**
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118 ``dc:message`` **TODO**
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119
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120 ``dc:variable`` **TODO**
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121
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122 ``dc:convert`` **TODO**
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123
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124
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125 Bedingte Ausführung
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126 ~~~~~~~~~~~~~~~~~~~
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127
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128 ``<dc:if>`` Einfaches Wenn-Dann ohne Sonst-Fall
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129 ...............................................
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131 .. code:: xml
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132
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133 <dc:if test="XPath-Ausdruck">
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134 ...
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135 </dc:if>
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136
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137 Der innere Teil wird nur dann betreten, wenn der XPath-Ausdruck zu
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138 logisch wahr evaluiert wird. Dieses Konstrukt kennt keinen alternativen
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139 Pfad, der betreten wird, falls der Ausdruck zu logisch falsch ausgewertet
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140 wird. Wird dies benötigt, muss man ``<dc:choose>`` benutzen.
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141 ``<dc:if>`` ist in Symmetrie zu ``<xsl:if>`` von XSLT entworfen worden.
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142
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143 ``<dc:choose>`` Ketten von Wenn-Dann-Ausdrücken
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144 ...............................................
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145
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146 .. code:: xml
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147
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148 <dc:choose>
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149 <dc:when test="XPath-Ausdruck 1"> ... </dc:when>
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150 <dc:when test="XPath-Ausdruck 2"> ... </dc:when>
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151 ...
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152 <dc:otherwise> ... </dc:otherwise>
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153 </dc:choose>
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154
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155 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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156 ``<dc:when>``- und ``<dc:otherwise>``-Elemente werden dann ignoriert. Evaluiert
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157 keiner der ``test``-Ausdrücke zu wahr, wird der innere Teil des
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158 ``<dc:otherwise>``-Elements betreten.
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159 ``<dc:choose>`` ist in Symmetrie zu ``<xsl:choose>`` von XSLT entworfen worden.
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160
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161
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162
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163 Datenkorb-Funktionen
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164 --------------------
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165
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166 ``dc:contains`` **TODO**
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167
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168 ``dc:fromValue`` **TODO**
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169
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170 ``dc:toValue`` **TODO**
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171
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172 ``dc:replace`` **TODO**
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173
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174 ``dc:replace-all`` **TODO**
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175
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176 ``dc:has-result`` **TODO**
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177
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178 ``dc:group-key`` **TODO**
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179
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180 ``dc:date-format`` **TODO**
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181
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182 ``dc:dump-variables`` **TODO**
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183
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184 ``dc:get`` **TODO**
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185
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187
http://dive4elements.wald.intevation.org