@abc.abstractmethod<EOL><INDENT>def get_type(self, namespace, identifier, authority):<DEDENT>
return<EOL>
Gets a ``Type`` by its string representation which is a combination of the authority and identifier.

        This method only returns the ``Type`` if it is known by the
        given identification components.

        :param namespace: the identifier namespace
        :type namespace: ``string``
        :param identifier: the identifier
        :type identifier: ``string``
        :param authority: the authority
        :type authority: ``string``
        :return: the ``Type``
        :rtype: ``osid.type.Type``
        :raise: ``NotFound`` -- the type is not found
        :raise: ``NullArgument`` -- ``null`` argument provided
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*