This was the only information I found when I developed unAPI support for 
our MetaLib installation: 
<http://forums.zotero.org/discussion/1229/unapi-support/>. Based on my 
experimentation and looking at the code, if my memory serves:

1. At least the formats mentioned in the forum post. I believe it uses 
the docs attribute to distinguish formats, as type can be e.g. 
application/xml for multiple formats.

2. Weird, but I don't remember how. I ended up providing only MARCXML, 
DC and RIS, because it chose MODS over MARCXML if it was available and 
did something that sucked. Things may have changed, this was in 2008.

3. Didn't test this one, we only provide a single record at a time.

4. It chose COinS over unAPI at least at the time, and I found that to 
be a bit problematic.

5. Dunno.

--Ere

On 6.4.2010 16:48, Jonathan Rochkind wrote:
> Anyone know if there's any developer documentation for Zotero on it's
> use of unAPI? Alternately, anyone know where I can find the answers to
> these questions, or know the answers to these questions themselves?
>
> 1. What formats will Zotero use via unAPI. What mime content-types does
> it use to recognize those formats (sometimes a format has several in
> use, or no official content-type).
>
> 2. What is Zotero's order of preference when multiple formats via unAPI
> are available?
>
> 3. Will Zotero get confused if different documents on the page have
> different formats available? This can be described with unAPI, but it
> seems atypical, so not sure if it will confuse Zotero.
>
> 4. If both unAPI and COinS are on a given page -- will Zotero use both
> (resulting in possible double-import for citations exposed both ways).
> Or only one? Or depends on how you set up the HTML?
>
> 5. Somewhere that now I can't find I saw a mention of a "Zotero RDF"
> format that Zotero would consume via unAPI. Is there any documentation
> of this format/vocabulary, how can I find out how to write it?
>