May 2018
Intermediate to advanced
680 pages
15h 54m
German
Content preview from XML -- Technologien, Grundlagen, Validierung, Auswertung
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DTD
Eine DTD (document type definition) legt die zulässigen Namespaces, Elemente und Attribute eines XML-Dokuments fest und definiert so die Struktur aller XML-Dokumente, die gegen diese DTD gültig sein sollen.
Eine DTD kann im XML-Dokument selber definiert werden, ebenso aber auch als externe Datei. Eine DTD ist selbst kein XML-Dokument, und es kann auch keine Datentypen für die Textinhalte (string, integer, double, dateTime, boolean, ...) definieren.
Ein Element kann als EMPTY, ANY oder mit einer Anzahl Kindknoten (#PCDATA), (child1,child2,...), (childx+), (childy*), (childz?), (child1|child2) deklariert werden. Parsed character data (PCDATA) werden geparst, im Gegensatz zu CDATA. PCDATA können Textinhalte, aber keine Kind-Elemente haben. ...
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