[development] Taxonomy: Multiple parents?

[Gerhard Killesreiter]

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Bill Fitzgerald schrieb:
> I've often wondered about this as well, and figured I was missing
> something.
> 
> But for this use case, two separate vocabularies would capture the same
> data, and it would be easier for the end user to comprehend:
> 
> Type of Fish
> -shark
> -salmon
> -eel
> -cod
> -trout
> -carp
> 
> Habitat
> -ocean
> -lakes
> -rivers
> -marsh
> -brackish

Makes sense to me.

> I think this is one of those cases where we should ask a librarian --
> when it comes to explaining uses for taxonomy/categorization, I have
> found that librarians can explain use cases I have never imagined.

What I am mainly concerned about is the upgrade path if we should drop
this special tree diagramm from Drupal's taxonomy module. How do we
avoid to screw up the site of somebody using it?

Cheers,
	Gerhard
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