RE: Schema aware transformations

> To get the real benefit of schema-aware XSLT processing, you
> really need to start defining match patterns in terms of
> schema-declared elements and types, for example
>
> <xsl:template
> match="schema-element(invoice)/delivery-address/postcode">
[snip]
> It's a fair investment to get started (time learning the
> ropes, and time establishing schemas for all your documents)
> but once you're over the curve, it makes the debugging cycle
> a completely different experience - instead of wrong or
> absent output, you get accustomed to expecting early error
> messages, often at compile time.

The problem here is that template match="schema-element(abc)" gets
rejected by the non-SA processor.  The leads onto some questions:

-Does the SA processor require a source schema for every transform (when
using schema-element() etc)?

-Is it possible to store the validated source (the PSVI?) and supply
that for subsequent transforms?

The point to my questions is that I wouldn't want to validate the same
source document every time I wanted to transform it.  If I could
validate it once and then use that per request that would solve that
issue.

Other than the 2.0 spec, are there any good resources out there for SA
processing?