While working on revisions, I noticed that we've been handling the titles of unpublished documents (articles, plays etc.) wrongly in the bibliography, according to Chicago.

It's gradually emerged that the list of references at the end of our articles is a Reference List as defined by Chicago, not a Bibliography, because dates are placed after the author, not at the end of the entry. Knowing this makes it easier to find out what we should actually do in any given case. For unpublished articles, Chicago says they should be rendered in quotes in notes or bibliographies, but without quotes in a reference list. (Why? Who knows.) We had been following the guidelines for bibliographies in this respect, when we should have been following the guidelines for references.

Therefore I've amended the code in the rendering of reference lists (both for XHTML and for PDF) so that it now renders unpublished titles without quotes. It took me a while to figure out where these changes should be made; the XSLT is now pretty complicated in that area.