anchor.diff:  URI: ('http://' | 'https://') TOKEN;
   TOKEN: ('a'..'z' | 'A'..'Z') ('a'..'z' | 'A'..'Z')*;
   DIGIT: '0'..'9'+;
  -WS: (' ' | '\t' | '\n' | '\r'){$channel = HIDDEN};+WS: (' ' | '\t' | '\n' | '\r'){$channel = HIDDEN;};
positive.code:   CLOSE_PATH = '>';
  }
  
  // ----------------------------------------
  // ---------- All OCCI Headers ------------
  // ----------------------------------------
  
negative.code: //TODO action links spec
  //TODO allow for multiple links per line seperated by ','
  link_header:
    LINK_HEADER  link_path rel_attr (self | link_category)* attributes_attr?
  ;
  
  link_path:
  