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functx:id-from-element

Gets the ID of an XML element

Description

The functx:id-from-element function takes the $element element and returns its attribute (there can only be one) that is of type xs:ID. If no such attribute exists, or if the argument is the empty sequence, the function returns the empty sequence. The attribute must have been declared to be of type xs:ID in a schema, and validated by that schema, for this function to return it.

Arguments and Return Type

XQuery Function Declaration

declare namespace functx = "http://www.functx.com";
declare function functx:id-from-element
  ( $element as element()? )  as xs:string? {

  data(($element/@*[id(.) is ..])[1])
 } ;

Examples

doc('https://www.datypic.com/functx./input/book.xml')

functx:id-from-element($book/book/section[1])

preface

See Also

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