How to use the asdf.reference.resolve_fragment function in asdf

json_id = url
            if isinstance(node, dict) and '$ref' in node:
                suburl = generic_io.resolve_uri(json_id, resolver(node['$ref']))
                parts = urlparse.urlparse(suburl)
                fragment = parts.fragment
                if len(fragment):
                    suburl_path = suburl[:-(len(fragment) + 1)]
                else:
                    suburl_path = suburl
                suburl_path = resolver(suburl_path)
                if suburl_path == url:
                    subschema = schema
                else:
                    subschema = load_schema(suburl_path, resolver, True)

                subschema_fragment = reference.resolve_fragment(
                    subschema, fragment)
                return subschema_fragment

            return node

def resolve_local(node, json_id):
            if isinstance(node, dict) and '$ref' in node:
                ref_url = resolver(node['$ref'])
                if ref_url.startswith('#'):
                    parts = urlparse.urlparse(ref_url)
                    subschema_fragment = reference.resolve_fragment(
                        schema, parts.fragment)
                    return subschema_fragment
            return node