May 2018
Intermediate to advanced
680 pages
15h 54m
German
Content preview from XML -- Technologien, Grundlagen, Validierung, Auswertung
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xs:element abstract, substitutionGroup
Zusätzliche Design-Alternativen für XML-Schema ergeben sich über abstrakte Elemente. Hierbei wird beispielsweise ein Dummy-Element definiert, das als Platzhalter für andere Elemente dient.
Wurde das Dummy-Element abstract=true gesetzt, muss es zwingend ersetzt werden, bei false kann das Dummy-Element auch selbst verwendet werden. Konzeptionell zeigt sich eine gewisse Nähe zur Deklaration xs:choice, in der ein Element diverse vorher definierte Child-Elemente haben kann, etwa: Ein Element Person habe entweder ein Hobby oder einen Beruf.
Kämen später zusätzliche Alternativen hinzu, meinetwegen Familie, Vereinsposten oder Haustier, so müsste die definierende Choice-Liste selbst ergänzt werden.
Bei abstrakten ...
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