May 2018
Intermediate to advanced
680 pages
15h 54m
German
Content preview from XML -- Technologien, Grundlagen, Validierung, Auswertung
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XQuery: concat, union, intersect, except
Ebenfalls zum Vergleich gegenüber XSL 2.0 finden Sie noch die XQuery-Syntax für Sequenzverkettungen, union, intersect und except.
Beachten Sie die unterschiedliche Definition der Variablen in Form von node()+ und node()*. Analog zur DTD-Syntax definiert + hier eine Nodelist mit mindestens einem Item; * bedeutet, dass die Itemlist auch leer sein kann. node()? würde alternativ 0 oder 1 Item erlauben, node() würde exakt 1 Item erfordern.
Die globale Variable $seq1 ist eine Verkettung (Komma-Operator!) der Elemente //Ort[1]/name und //Ort[2]/name. $seq2 ist eine analoge Verkettung der Elemente //Ort[2]/name und //Ort[3]/name.
declare variable $seq1 as node()+ := (//Ort[1]/name, //Ort[2]/name); declare ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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