Kevin Howe writes:

... <dtml-tree expr="PARENTS[-1]" branches_expr="objectValues()" sort=id> ... What I would like to do is display these objects, but ONLY IF they currently contain some objects, so that if an object does not contain any subobjects at the moment, it is not displayed. Search the searchable list archive.

There has recently been a thread about filtering for "dtml-tree". Search for "branches_expr" to locate the thread. Dieter