fn.namespaceUriForPrefix

fn.namespaceuriforprefixfnnamespaceuriforprefix

/apidoc/8.0/fn:namespace-uri-for-prefix.xml

Returns the namespace URI of one of the in-scope namespaces for $element, identified by its namespace prefix.

If $element has an in-scope namespace whose namespace prefix is equal to $prefix, it returns the namespace URI of that namespace. If $prefix is the zero-length string or the empty sequence, it returns the namespace URI of the default (unnamed) namespace. Otherwise, it returns the empty sequence.

Prefixes are equal only if their Unicode code points match exactly.

A namespace prefix to look up.

prefix

String?

An element node providing namespace context.

element

Node

String?

var x = xdmp.unquote(
  '<ex:hello xmlns:ex="http://example.com/example">1</ex:hello>');
var el = x.toArray()[0].xpath("/element()");
fn.namespaceUriForPrefix("ex", el);

=> the namespace URI corresponding to
   "http://www.example.com/example".