docs: def build(self, builder):
          """Build XML by appending to builder"""
          params = dict(OID=self.oid,
                        Name=self.name)
          if self.location_type:
              params.update(dict(LocationType=self.location_type.value))
          # mixins
          self.mixin()
          self.mixin_params(params)
          builder.start("Location", params)
          for mdv in self.metadata_versions:
              mdv.build(builder)
          builder.end("Location")