Function use in the IdP

[Rod Widdowson]

> Where we intend people to use Spring, we've tried
> to prove that out, but the metadata, resolver, and filter are still
> targeted to the custom syntax without much attention to whether native
> would be usable for mortals.

This is true of course.  I'm concerned about making too many changes to the
custom schemas to invent further spring plug points.  I also have a "Release
time is approaching, now would be a good time for me to stop tinkering" feel
about this.

I'll take guidance.

R