zmmailbox + REST

[JaymeH]

I have question about using zmmailbox and getRestURL. Specifically I would like to know what can be in the "query" part of the getRestURL. So far I've only been able to find that "subject:", "from:", and "in:" can be used. What other useful things might one put in there to search on? Is there an "attachment:", "Content-Type:", or "Date:"? If there are such beasties available, how do I find out the specific format I should construct my query in? I tried looking at the REST wiki and I either missed seeing it or I'm just not getting something. Any help would be much appreciated.