\class grob property

[Urs Liska]

Hi all,

I'm thinking about having a new grob property \class, but before digging 
deeper I'd like to put the idea up for discussion.

This would have two different goals:

1) for SVG output the objects would get the class assigned (along with 
an id). I don't have any idea yet how that is implemented, though. This 
will make it possible to work with CSS in a display environment.

2) (Formatting) functions can check for a grob's class to perform e.g. 
highlighting operations (=> color all NoteHeads with class "temporary" red)

In addition I would like to use that to export class information to 
MusicXML.

Any comments or objections?
Urs