bibliography with certain canonical reference

It is possible that the answer to my question already lies somewhere in 
the extensive (new) bibliography material in contextgarden, but if so I 
have missed it. And indeed it may be a very simple solution, but I can't 
work it out at the moment.

I am typesetting an academic work by an author who wants local (end of 
chapter) bibliographies as well as, obviously, a final complete 
bibliography. No problem. I can do that and in fact have done so 
successfully. My problem lies with one particular set of citations from 
Augustine's/Confessions/, where the canonical references are something 
like Augustine, 1991, /Confessions/ X.33.50.  All I can manage to 
produce at the moment is the usual author-year APA inline format 
(Augustine, 1991) [Obviously we are referring to a modern 1991 
translation, but that is immaterial here].

My current set up is:

\usebtxdataset

   [main]

[references.bib]

\usebtxdefinitions

   [apa]

  

\definebtxrendering

   [chapterlist]

   [apa]

   [dataset=main,

    sorttype=authoryear]

\definebtxrendering

   [finallist]

   [apa]

   [dataset=main,

    sorttype=authoryear]

And where I need to reference Augustine inline I write, e.g. 
\cite[authoryear][main::augustine1991confessions] which gives me 
(Augustine, 1991). Is there is a way I can also include X.33.50 in this 
inline reference, but only for the Augustine citations? All other 
citations are strictly author-year.

Julian

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