/usr/local/lib/swipl/library/ext/sgml/sgml_write.pl
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 xmlns(?NS, ?URI) is nondet[multifile, library(sgml_write)]
Hook to define human readable abbreviations for XML namespaces. xml_write/3 tries these locations:
  1. This hook
  2. Defaults (see below)
  3. rdf_db:ns/2 for RDF-DB integration

Default XML namespaces are:

xsihttp://www.w3.org/2001/XMLSchema-instance
xshttp://www.w3.org/2001/XMLSchema
xhtmlhttp://www.w3.org/1999/xhtml
soap11http://schemas.xmlsoap.org/soap/envelope/
soap12http://www.w3.org/2003/05/soap-envelope
See also
- xml_write/2, rdf_register_ns/2.