Several foci in the same facet

"[Louie]  what if several foci under a given facet
apply to an entitiy being classified?"

The simpler answer that has occurred to me until now is just to repeat
the facet, like a repeatable field in a database:

C	containers
C4	containers by material
C4g	containers made of glass
C4w	containers made of wood
C4g4w	containers made of glass and of wood



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