Change the format.artperiodincoll.title

Hi!

I have the problem of "hardcoding" a comma in \jbapifont and a period
in \bibapifont in order to get the following results: Author "Title,"
Journal etc. and Author "Title." Journal etc., respectively. Now the
problem is, there are some titles which already have a punctuation
mark, like a question mark. This leads to the following result: Author
"Title?," Journal etc., which is perfectly consistent with what I
coded, but somehow non-satisfying.

I then decided to have an additional entry-type in my .bib-file called
"sign" for any other puncuation mark, looking like sign = {?}, which I
wanted to include in my format.artperiodincoll.title. But if I write

FUNCTION {format.artperiodincoll.title}
{ title empty$
      { "" }
      { sign emtpy$
       { "\bibapifont {" title check.punct.instead.of.add.period *
        crossref missing$
            { format.titleaddon * }
            'skip$
          if$
         }
        if$
       }
       { something to get "title and sign in quotation marks"}
   if$
}

I don't get any titles at all for some entries in the bibliography. I
guess I forget some if$ or } or something else. Maybe someone can help
me out?

Thank you for your help, Katrin

PS: I haven't tried to change format.btitle.vol yet, that will be the
next step.



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