#markup_language  a set of symbols and rules for their use when doing a markup of a document
  supertype:  #terminology__nomenclature__language  a system of words used in a particular discipline; "legal terminology"; "the language of sociology"
  subtype:  #standard_generalized_markup_language__SGML  (computer science) a standardized language for the descriptive markup of documents; a set of rules for using whatever markup vocabulary is adopted
  subtype:  #HTML__hypertext_markup_language  a set of tags and rules (conforming to SGML) for using them in developing hypertext documents
  subtype:  pm#XML  the language for describing XML-based languages; see http://www.w3.org/XML
  subtype:  pm#XML_based_language__XML_based_notation  any notation following an XML schema; see http://www.w3.org/
     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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