def label(self, subject, default=''):
        if subject is None:
            return default
        return self.value(subject, RDFS.label, default=default, any=True)
true if user has 'add', 'change' or 'delete' permission on this model
dataset/ETHPy150Open RDFLib/rdflib/rdflib/graph.py/Graph.label--crossover with--dataset/ETHPy150Open torchbox/wagtail/wagtail/wagtailsnippets/permissions.py/user_can_edit_snippet_type