I have a committee content type defined using xml on the Plone backend.
The path to the xml would be something like: mysite.content.src.mysite.content.content.committee.xml
<model xmlns:easyform="http://namespaces.plone.org/supermodel/easyform"
xmlns:form="http://namespaces.plone.org/supermodel/form"
xmlns:i18n="http://xml.zope.org/namespaces/i18n"
xmlns:indexer="http://namespaces.plone.org/supermodel/indexer"
xmlns:lingua="http://namespaces.plone.org/supermodel/lingua"
xmlns:marshal="http://namespaces.plone.org/supermodel/marshal"