[elephant-devel] virtual subtree?

[Joe Corneli]

I am wondering whether it is possible to efficiently treat a subset of
a given btree as its own tree.  Specifically: if I have a collection
of miscellaneous data, which I'll call Things, some of which are
Triples, can I specifically examine all of the Triples in my
collection, and from that sub-set, find those Triples whose first slot
is, say, equal to 5?

Or must I do what seems to be the expected thing, and treat Things and
Triples as a separate btrees if I want to efficiently search through
the slots of my Triples?