anchor.diff:  
   Relationships may be simple, associative (linked), or subtype/supertype.
   Relationships do not support extended names and the name of a relationship must
  -be with the character 'R' followed by a positive integer:
  +begin with the character 'R' followed by a positive integer:
   
   Simple relationships are defined by a pair of opposing "half relationships"
   defining the relationship from both directions. Each direction can have a
  
positive.code: entities, but generalized for all elements.
  
  Extended names are composed of a string of characters enclosed in single
  quotes. There is no restrictions on characters within extended names except
  they may not include single quotes or line breaks.
  
  The following elements support extended names:
  
negative.code: - State Entry Action
  - Transition Action
  
  Action bodies are expected to be defined in files separate from the structural
  models and handled by a parser/loader specific to the action language used. The
  action language parser is responsible for loading individual action bodies and
  associating them with executable model elements declared in the structural
  