def __is_metadata(self, key):
if key.startswith("<STR_LIT>") and key.endswith("<STR_LIT>"):<EOL><INDENT>return True<EOL><DEDENT>else:<EOL><INDENT>return False<EOL><DEDENT>
Check to see if the property is hidden metadata
e.g. "__type__", "__comments__", "__position__"