code: def p_spdx_id(self, p):
          
          if six.PY2:
              value = p[2].decode(encoding='utf-8')
          else:
              value = p[2]
          if not self.builder.doc_spdx_id_set:
              self.builder.set_doc_spdx_id(self.document, value)
          else:
              self.builder.set_file_spdx_id(self.document, value)
docs: spdx_id : SPDX_ID LINE