On Mon, 07 Jun 2004, Paco apparently wrote:
> My idea is to add an additional property, a user assignable name, to
> objects. So, for example, a user assigns 1x2 rectangles the name "A",
> and 1x1 rectangles the name "B"; later one would be able to select
> objects by the user defined name and change a property--say color--for
> all "B"s. A further development might be the ability to select objects
> by multiple matching property values.
It seems you are asking for Dia to support CSS.
I think this has been discussed in the past.
As a user, I find it a good idea.