Names are always a pair:
A local name that is an identifier.
A namespace name that is an absolute URI or "no value".
The namespace name does not occur syntactically in a name.
But there is the non-standardized "Clark Notation" for names: {uri}local-name
{http://www.w3.org/1999/xhtml}a
{urn:publicid:IDN+mathdoc.org:schema:slides:2004:1.0:us}slide
{}doc