resolve-QName function

If qualified-name is not the empty sequence, the returned value is an expanded name that is constructed as follows:

• The prefix and local name of the expanded QName is taken from qualified-name.
• If qualified-name has a prefix, and that prefix matches a prefix in the in-scope namespaces of element-for-namespace, the namespace URI to which this prefix is bound is the namespace URI for the returned value.
• If qualified-name has no prefix, and a default namespace URI is defined in the in-scope namespaces of element-for-namespace, this default namespace URI is the namespace URI for the returned value.
• If qualified-name has no prefix, and no default namespace URI is defined in the in-scope namespaces of element-for-namespace, the returned value has no namespace URI.
• If the prefix for qualified-name does not match a namespace prefix in the in-scope namespaces of element-for-namespace, or qualified-name is not in the form of a valid qualified name, an error is returned.

The following query returns the expanded QName that corresponds to the URI http://www.mycompany.com and the lexical QName comp:dept:

declare namespace d="http://www.mycompany.com";
let $department := document {
<comp:dept xmlns:comp="http://www.mycompany.com" id="A07">
  <comp:emp id="31201" />
</comp:dept> }
return fn:resolve-QName("comp:dept", $department/d:dept/d:emp)