def forward_reference(self, slot_range: str, owning_class: str) -> bool:
for cname in self.schema.classes:<EOL><INDENT>if cname == owning_class:<EOL><INDENT>return True             <EOL><DEDENT>elif cname == slot_range:<EOL><INDENT>return False            <EOL><DEDENT><DEDENT>return True<EOL>
Determine whether slot_range is a forward reference