def serialize_operator_equal(self, op):
elem = etree.Element('<STR_LIT>')<EOL>return self.serialize_value_list(elem, op.args)<EOL>
Serializer for :meth:`SpiffWorkflow.operators.Equal`.

Example::

    <equals>
        <value>text</value>
        <value><attribute>foobar</attribute></value>
        <value><path>foobar</path></value>
    </equals>