Bertrand Gaiffe wrote 
> For encoding bibliographic r?f?rences (books in our case), we have the 
> choice between bibl and biblStruct.

There is an XSL style sheet for conversion from bibl to biblStruct:
http://wiki.tei-c.org/index.php/Bibl2struct.xslt

> In case we choose biblStruct, I have two questions :
> 	1) is <series> the good choice for such things as "la Com?die humaine" of 
> Blazac ?

I think so, because the author himself named the series title and
AFAIK also fixed the extent and volume numbers. If that had been
made by a historian, or a biographer, then no.

See also 3.11.2.4.: Series information may (in bibl elements) or must (in
biblStruct elements) be enclosed in a series element or (in a biblFull
element) a seriesStmt element. The title of the series may be tagged
title level="s", the volume number biblScope type="vol", and
responsibility statements for the series (e.g. the name and affiliation
of the editor, as in the example in section 3.11.2.1 Analytic,
Monographic, and Series Levels) may be tagged editor or respStmt.

>         2) is it on purpose that <idno> is avalaible into <bibl> and not in 
> <biblStruct> ?

Not so. See
http://www.tei-c.org/release/doc/tei-p5-doc/html/ref-idno.html

idno is used by biblStruct.


Regards,
ralf