def get_html_tag_attributes(cls, instance):
        """
        Returns a dictionary of attributes, which shall be added to the current HTML tag.
        This method normally is called by the models's property method ``html_tag_ attributes``,
        which enriches the HTML tag with those attributes converted to a list as
        ``attr1="val1" attr2="val2" ...``.
        """
        attributes = getattr(cls, 'html_tag_attributes', {})
        return dict((attr, instance.glossary.get(key, '')) for key, attr in attributes.items())
Returns a dictionary of attributes, which shall be added to the current HTML tag.
        This method normally is called by the models's property method ``html_tag_ attributes``,
        which enriches the HTML tag with those attributes converted to a list as
        ``attr1="val1" attr2="val2" ...``.