pm#XML_based_language__XML_based_notation  any notation following an XML schema; see http://www.w3.org/
  supertype:  #markup_language  a set of symbols and rules for their use when doing a markup of a document
  subtype:  pm#XHTML  description in http://www.w3.org/MarkUp/
  subtype:  pm#SVG  Scalable Vector Graphics; description in http://www.w3.org/Graphics/SVG/
  subtype:  pm#RDF/XML  XML notation for the RDF model
     instance:  pm#RDF_syntax_of_22-02-1999
  subtype:  pnml#PNML  the PNML language
     subtype:  pnml#EPNML
     subtype:  pnml#PNK

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