code: def p_spdx_version_1(self, p):
          
          try:
              if six.PY2:
                  value = p[2].decode(encoding='utf-8')
              else:
                  value = p[2]
              self.builder.set_doc_version(self.document, value)
          except CardinalityError:
              self.more_than_one_error('SPDXVersion', p.lineno(1))
          except SPDXValueError:
              self.error = True
              msg = ERROR_MESSAGES['DOC_VERSION_VALUE'].format(p[2], p.lineno(1))
              self.logger.log(msg)
docs: spdx_version : DOC_VERSION LINE