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176 results:

101. XPath | XPath introduction | Location paths

Location paths A location path is a formulation which allows the access and selection of certain nodes or node sets within a XML document. Location paths can have a…

102. XPath | XPath introduction | Filtering with predicates

Filtering with predicates With the help of XPath expressions, each requested node can be selected within a XML document. In order to be able to define result sets of nodes and with that to be…

103. XPath | XPath introduction | Expressions on sequences

Expressions on sequences Alternatively to path expressions, expressions on sequences are often used in order to realise a filtering. SignatureDescription fn:position() as xs:integer provides the…

104. XQuery | FLWOR structure

The general FLWOR structure The peculiarity of XQuery in comparison to simple path expressions as being introduced in XPath 1.0 is that XML documents are no longer filtered…

105. XQuery | FLWOR structure | FLWOR expressions

FLWOR expressions Each "meaningful" XQuery instruction is based on a FLWOR expression which represents, similar to the SELECT-FROM-WHERE in SQL, the base for queries…

106. XQuery | FLWOR structure | Let and For clause

Let and For clause Let and for clauses enable the binding of variables to results of any XQuery expressions, whereby, as shown in the further course, the results of path expressions are…

107. XPath | XPath introduction | The predicate evaluation

The predicate evaluation The following pages are from the German book "XQuery – Grundlagen und fortgeschrittene Methoden" (XQuery – basics and advanced methods). The…

108. XQuery | FLWOR structure | Binding of several variables

Binding of several variables In a FLWOR expression it is possible to bind simultaneously several variables by a let or a for instruction. let $x := ..., $y := ... for $x…

109. XQuery | FLWOR structure | Explicit type testing

Explicit type testing As a further property of the for and let clauses, there is the possibility to perform a type testing via an explicit type declaration by means of the additional key…

110. XQuery | FLWOR structure | Where clause

Where clause Analogous to the SELECT-FROM-WHERE block in a SQL query, the where clause of XQuery enables the filtering of the data streams. If the expression of a where…

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