missing topology_template

When importing the Definition from the sample CSAR recently shared in TOSCA WG, I get an error that "topology_templates" is an unknown field. According to wd05-rev11, the topology_template should contain input, node_templates, relationship_templates, etc..
Note that the spec mentions singular "topology_template" and the sample CSAR has the plurar form "topology_templates". I assume the spec is correct and it should be the singular form.

        for name in self.tpl:
            if name not in SECTIONS:
> raise UnknownFieldError(what='Template', field=name)
E UnknownFieldError: Template contain(s) unknown field: "topology_template", refer to the definition to verify valid values.