Relation pm#name (?,?)
  exclusion:  attributive_relation  purpose  has-author  owned-by  owner  owner_of  leader  seller  customer  generator  creator  spatial_origin  exploits  has_purpose  has_purpose_for_agent  measure  attribute  Date  value  rdf_reification_relation  support  example  syntax  has-magnitude
  supertype:  attributive_relation__attributiverelation  like pm#binary_relation, this type mostly exists to categorize what cannot be categorized elsewhere
  subtype:  Title (? -> entity)  to specify a name of a resource
  subtype:  Identifier (? -> string)  to specify a reference that is unambiguous within a given context; SHOULD NOT BE USED IN WEBKB
     subtype:  identifier (entity -> Literal)  a relation between an individual of a concept and the identifier of that concept; the identifier is a concrete data type, usually non_meaningful from the lexical viewpoint; useful to map many database relationships
  subtype:  label (?,string)  in WebKB, with FO, use the link '_'
     subtype:  name (entity,Literal)  a relation between an instance of a concept and the name (instance of a concrete data type) of that concept; the name has to be a lexically meaningful name
     subtype:  has-pretty-name (?,string)
     subtype:  has-variant-name__hasvariantname (?,string)
  subtype:  plural (?,string)  to specify plural names; do not use in WebKB
  subtype:  singular (?,string)  to specify singular names; do not use in WebKB