anchor.diff:  traitsFacet:
       'traits'
           (
  -            SCALAR
  +            empty=id
               |   (
                       MAP_START
                       ( traitFacet )*
  
positive.code:     );
  
  traitFacet:
      name=SCALAR
      (
          SCALAR |
          (
              MAP_START
                  methodBaseFacet*
  
negative.code: methodFacet:
      httpMethod
      (
          empty=id |
          (
              MAP_START
                  methodBaseFacet*
  