anchor.diff:    CLOSE_PATH = '>';
   }
   
  -
  -// ---------------------------------------- 
  -// ---------- Category attribute ---------- 
  -// ---------------------------------------- 
  +occi_header:
  +    category_header
  +  | link_header
  +  | attribute_header
  +  | location_header
  +;
  +
  +// ----------------------------------------
  +// ---------- Category attribute ----------
  +// ----------------------------------------
   
   /*
   ABNF representation of category from the http rendering specification
  
positive.code: ;
  
  attributes_attr:
    attribute_attr+
  ;
  attribute_attr:
    CAT_ATTR_SEP attribute_attr_name VAL_ASSIGN attribute_attr_val
  ;
  attribute_attr_name:
    ATTRIB_NAME
  
negative.code: ;
  
  
  // ----------------------------------------
  // ------ X-OCCI-Attribute attribute ------
  // ----------------------------------------
  /*
  
  ABNF representation of X-OCCI-Attribute from the http rendering specification
  