Just wrote quite a long piece about what's been going on in Arabica over the past four months then, like a burk, killed Firefox. Hurrr.
What I'd said, in a rather long winded and rambling way, was that import precedence is now works correctly for all cases, not just mainly implemented for the common cases, a couple of nagging little bits got sorted out, and over the past few weeks I've implemented xsl:key and key(). As many times before, James Clark's concise and subtle spec text has been a pleasure to work with, and I've surprised myself with how easily I've been able to implement a feature. I've been working with this code for a long time now, but it really is holding up.