attribute resolver script

[Cantor, Scott]

> To be fair, the wiki page on MappedAttributeDefinition does say “many-to-
> many”. That didn’t sink in on first read.

My issue with it seems to be that I'm not sure under what conditions it seems to produce output that makes sense. It doesn't seem to do what I would think it would, so I'm not clear on whether that's a failure in design or if we're just missing a plugin that does what I would expect.

To me, given each value of input, I would think you'd get *a* mapped or default value out (or nothing if there's no match and no pass through). If that's not what it does, then I don't know why or why that's useful.

-- Scott