@classmethod<EOL><INDENT>def register_term_class(cls, term_name, class_or_name):<DEDENT>
cls.term_classes[term_name.lower()] = class_or_name<EOL>
Register a Term subclass for a qualified term name.

:param term_name: Fully-qualified term name. Will be converted to lowercase.
:param clz: A class, or fully-qualified, dotted class name.
:return: