p3p#User.home-info.telecom.telephone.ext__user__ext  telephone extension
  supertype:  p3p#UnstructuredDataElement  A data element with no component parts
     supertype:  p3p#DataElement  A specific item of data a service might collect
        supertype:  pm#P3P_thing
           supertype:  pm#thing_categorized_in_an_ontology
              supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type
  supertype:  p3p#Category-physical__physical  Information that allows an individual to be contacted or located in the physical world - such as telephone number or address.
     supertype:  p3p#Category-demographic__demographic  Data about an individual's characteristics - such as gender, age, and income
        supertype:  p3p#Category
           supertype:  pm#P3P_thing

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