Jakob, there isn't a single data element that represents the FRBR Work  
-- Work is a complexity, and generally needs at least a creator and a  
title, more in some cases. However, the Work title is not the same as  
the title of the "instance" and most current library records do NOT  
have a Work title (and thus are not easy to fit into FRBR).

The nearest thing to a work "data element" that we have is an  
author/title uniform title. Thus, on a MARC or MODS record for:

Mann, Thomas, 1875-1955
   Joseph and his brothers

You *should* have (but often don't) a uniform/Work title:

[Joseph und seine Bru?der]

And a corresponding authority heading in the authority file:

Mann, Thomas, 1875-1955. Joseph und seine Bru?der.

p.s. actually, it's even messier than that, but I simplified for the  
sake of clarity.

Quoting Jakob Voss <[log in to unmask]>:

> Hi,
> I tried to create a controlled link for the titleInfo element and do  
> not fully understand what a controlled 'title' exactly means in MODS.
> It looks like <titleInfo> is a good place to link a record to a FRBR  
> Work entity, right?
> <titleInfo valueURI="">
>   <nonSort>The </nonSort>
>   <title>C programming language</title>
> </titleInfo>
> If title authorities do not reference works, what do they reference  
> instead, and where can I best put an authority link to a FRBR work  
> in MODS?
> Thanks!
> Jakob
> -- 
> Jakob Voß <[log in to unmask]>, skype: nichtich
> Verbundzentrale des GBV (VZG) / Common Library Network
> Platz der Goettinger Sieben 1, 37073 Göttingen, Germany
> +49 (0)551 39-10242,

Karen Coyle
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ph: 1-510-540-7596
m: 1-510-435-8234
skype: kcoylenet