FunctX XQuery Function Library > Sequences > Checking Contents >

functx:is-node-in-sequence

Whether an XML node is in a sequence, based on node identity

Description

The functx:is-node-in-sequence function returns a boolean value indicating whether or not a node is in the specified sequence, based on node identity. It does not identify nodes that are descendants of nodes in the sequence; see functx:is-node-among-descendants for that purpose. If $node or $seq is the empty sequence, it returns false.

Nodes are identified based on node identity, not their contents. For a similar function based on the contents of a node, see functx:is-node-in-sequence-deep-equal.

Arguments and Return Type

XQuery Function Declaration

declare namespace functx = "http://www.functx.com";
declare function functx:is-node-in-sequence
  ( $node as node()? ,
    $seq as node()* )  as xs:boolean {

   some $nodeInSeq in $seq satisfies $nodeInSeq is $node
 } ;

Examples

<prices>
   <price value="29.99" discount="10.00"/>
   <price value="39.99" discount="6.00"/>
   <price value="49.99" discount=""/>
</prices>

<price value="49.99" discount=""/>

functx:is-node-in-sequence(
     $in-xml/price[1],$in-xml/price)

true

functx:is-node-in-sequence(
     $in-xml/price[1],$in-xml)

false

functx:is-node-in-sequence(
     $aPrice,$in-xml/price)

false

See Also

History