How to use the catalogue.mappings.MD_CORE_MODEL function in catalogue

def parse_configuration(self, config, context):
        self.config = ConfigParser.SafeConfigParser(self.config_defaults)
        if isinstance(config, str):
            self.config.readfp(open(config))
        elif isinstance(config, dict):
            for section, options in config.items():
                self.config.add_section(section)
                for k, v in options.items():
                    self.config.set(section, k, v)
        self.context = context
        self.context.md_core_model = mappings.MD_CORE_MODEL
        self.context.refresh_dc(mappings.MD_CORE_MODEL)

def parse_configuration(self, config, context):
        self.config = ConfigParser.SafeConfigParser(self.config_defaults)
        if isinstance(config, str):
            self.config.readfp(open(config))
        elif isinstance(config, dict):
            for section, options in config.items():
                self.config.add_section(section)
                for k, v in options.items():
                    self.config.set(section, k, v)
        self.context = context
        self.context.md_core_model = mappings.MD_CORE_MODEL
        self.context.refresh_dc(mappings.MD_CORE_MODEL)