csl metadata

OK, we need to deal with the source element per Dan’s note the other day.

We also need to figure out how best to handle this example:

http://forums.zotero.org/discussion/536/4/what-other-citation-formats-would-you-like-zotero-to-generate/#Item_2

Any ideas?

Fianlly, and on a related note, do we need to add back the "basedOn"
element we earlier had, which allows us, for example, to say that style
x is based on style y?

Bruce