code: def unpack_boolean(self, data):
          
  
          if data is None:
              return None
  
          # CIM-XML says "These values MUST be treated as case-insensitive"
          # (even though the XML definition requires them to be lowercase.)
  
          data_ = data.strip().lower()                   # ignore space
  
          if data_ == 'true':
              return True
  
          if data_ == 'false':
              return False
  
          if data_ == '':
              warnings.warn("WBEM server sent invalid empty boolean value in a "
                            "CIM-XML response.",
                            ToleratedServerIssueWarning,
                            stacklevel=_stacklevel_above_module(__name__))
              return None
  
          raise CIMXMLParseError(
              _format("Invalid boolean value {0!A}", data),
              conn_id=self.conn_id)
docs: Unpack a string value of CIM type 'boolean' and return its CIM data
          type object, or None.
  
          data (unicode string): CIM-XML string value, or None (in which case
            None is returned).