higgins#TimeSpan
  higgins#validFrom:  xsd#date [*,48..49]
  higgins#validTo:  xsd#date [*,48..49]
  supertype:  higgins#Value
     supertype:  pm#Higgins_DigitalSubject_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
     supertype:  pm#Higgins_Attribute_or_Value
        supertype:  pm#Higgins_object

No statement uses or specializes higgins#TimeSpan; click here to add one.