@classmethod
def is_approved(cls, tag, configuration=None):
    """
        Return if tag is an approved one or not

        Args:
            tag (str): Tag to check
            configuration (Optional[Configuration]): HDX configuration. Defaults to global configuration.

        Returns:
            bool: True if tag is approved, False if not
        """
    if tag.lower() in cls.approved_tags(configuration):
        return True
    return False
