in news:web.41ab3eac68021735b6f79dd70@news.povray.org Allen wrote:

> The idea is that all POV-Ray elements would have support or a 'group'
> keyword.  This keyword would take a string parameter that would
> contain a comma seperated list of groups that the item belongs to.

You can use 'unions' for most of that. #declare your objects, then 
#declare unions containing more or less of these objects. Objects can be 
in multiple unions.

Ingo

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