Allow to asign multiple parents to a taxonomy term

[Atoon]

I think it will be nice to allow terms in hierachical taxonomies to have more than one parent.

[nacin]

There are no plans indicated for major changes to the taxonomy schema, which would be required for this. Suggesting wontfix.

[vlasky]

I and a number of other WordPress users I know want the ability to assign multiple parents to a child category.

Perhaps major changes to the schema can be avoided by having the concept of a 'primary' parent category/taxonomy and then having a separate table/structure with the additional parent categories?

I am prepared to offer money to someone that is prepared to implement this support.

[nacin]

There are zero plans to change the term/taxonomy schema in the future. Additionally, even if there were minor adjustments, multiple parents completely destroy the concept of a hierarchy and would likely have absolutely zero traction from the core developers.

Multiple parents would result in a half-baked schema, UI, and changes to the taxonomy API for hierarchical taxonomies. It's just not going to happen.

Based on your proposed solution, a plugin could implement what you're looking for.

[scribu]

vlasky, what you're really asking for is many-to-many relationships between terms. This can be easily achieved with a non-hierarchical taxonomy plus an extra terms2terms table.