[Biopython] Entrez.read(handle) AND handle.read() on the same handle?

[richard k belew]

there must be a simple way to do this, but i've
not figured it out:

i want to sniff at aspects of a record (using the
dictionary returned by Entrez.read(handle)) and then
cache the XML version (returned by handle.read()),
only if it meets certain criteria.  and without
doing two separate efetch's!

has anyone else bumped into this pattern?

	rik