Dataview identities
The identities view lists all groups using a reference. Using this you can retrieve further information about the respective group.
<um:groups xmlns:um="http://onionworks.net/2004/usermanagement" xmlns:onion="http://onionworks.net/2004/data">
<um:group um:href="onion://usermanagement/groups/1" />
<um:group um:href="onion://usermanagement/groups/3" />
<um:group um:href="onion://usermanagement/groups/6" />
</um:groups>Dataview for xlink onion://usermanagement/groups