higgins#NormalizedStringAttribute
  subtype:  higgins#NormalizedStringSimpleAttribute (pm)
  supertype:  higgins#Attribute  Instances of this class are used as the domain of higgins:metadata properties that, taken together, are considered to be the metadata about a higgins:attribute sub-property.
     supertype:  pm#Higgins_Attribute_or_Value
        supertype:  pm#Higgins_object
           supertype:  dolce#particular  a 0-order type
              supertype:  pm#individual__particular___supertype_of_1st_order_types  all individuals (for concepts or relations) are implicitely or explicitely instance of that type
                 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

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