I just converted those examples in trunk to use 0.4 style queries.
querying along a self-referential path looks like:
session.query(Document).join('_nodes',
aliased=True).filter(and_(_Node.parent_id==None,
_Node.tag=='somefile')).\
join('children', aliased=True,
from_joinpoint=True).filter(_Node.tag=='header').\
join('children', aliased=True,
from_joinpoint=True).filter(and_(_Node.tag=='field1',
_Node.text=='hi')).\
one()
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