docs: def build(self, builder):
          """Build XML by appending to builder"""
          params = dict(OID=self.oid, Name=self.name, DataType=self.datatype.value)
          if self.sas_format_name is not None:
              params["SASFormatName"] = self.sas_format_name
          builder.start("CodeList", params)
  
          for item in self.codelist_items:
              item.build(builder)
  
          for alias in self.aliases:
              alias.build(builder)
  
          builder.end("CodeList")