I'd like to sort references so a given publisher's ("BBF") references are listed first, and am wondering whether it's possible to compare the publisher variable with "BBF". I tried, but it doesn't seem to work (and the CSL spec. doesn't appear to indicate that you can do this), so I've fallen back on using original-publisher (I'll have to make sure that all the BBF references use this rather than publisher). This works, but I'd prefer the first approach. Any suggestions?

CSL is attached.

Thanks,

William