anchor.diff:    action-uri       = URL "?" "action=" term
   */
   //TODO action links spec
  +//TODO allow for multiple links per line seperated by ','
   link_header:
     LINK_HEADER  link_path rel (self | link_category)* attributes_attr?
   ;
  
positive.code:       attributes="occi.storage.size occi.storage.state";
        actions="http://schemas.ogf.org/occi/infrastructure/storage/action#resize ...";
  */
  
  category_header:
    CATEGORY_HEADER term scheme class (title | rel | location | attributes)*
  ;
  
  term:
    TOKEN
  ;
  
negative.code: // ----------------------------------------
  
  occi_header:
    ( category_header
    | link_header
    | attribute_header
    | location_header
    )+
  ;
  
  // ----------------------------------------
  