XSLT and XPath function reference in alphabetical order
(Excerpt from “XSLT 2.0 & XPath 2.0” by Frank Bongers, chapter 5, translated from German)
Functions in connection with qualified identifiers (QNames)
A sequence of items of xs:string type which contain all namespace prefixes being valid for the element passed on, each in the lexical form of a xs:NCName NCName. If the element is in no namespace, the empty sequence is returned.
A node of element() type. The empty sequence is not permitted as value.
Purpose of use:
The fn:in-scope-prefixes() function returns the namespace prefixes being valid for the element passed on. This is achieved in the form of a sequence which contains all appropriate prefixes as string items.
If the element is in the default namespace which has no prefix, fn:in-scope-prefixes() returns the empty string. If, however, the element passed on to the function has no namespace, an empty result sequence is returned.
The function is not available.
fn:in-scope-prefixes($element as element()) as xs:string*
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