Constrain directly on a handle

Support a query condition that constrains the nodes based directly on their 
handle. This might seem 
counterintuitive, querying node handles that you already have the handles of, 
but they are part of a larger query, where it is not evident whether these 
nodes satisfy the query.

For example: returning all ancestors of a node including the start atom itself. 
Ancestors can be constrained using a BSFCondition. For this condition, I query 
the start atom separately so 
I already have the handle. However, in some cases the start atom itself also 
needs to be returned. Not being able to directly constrain by handle would 
result in repeated constraints.

See 
http://groups.google.com/group/hypergraphdb/browse_thread/thread/929f74130a50fc2
c for the full discussion including implementation ideas.

Original issue reported on code.google.com by cgbeek...@gmail.com on 21 Jun 2011 at 6:26

jlowenz / hypergraphdb

Constrain directly on a handle #62