Hierarchical Items

Thought I'd resurrect this idea for a bit and see if anyone in the loop knows what the plans are for hierarchical items. There's been so much development in the push for 2.0 -- but this is the one thing that I've been pining for, and it seems to have gotten lost. Is this still in the cards for Zotero's future?

http://forums.zotero.org/discussion/391/2/hierarchical-item-relationships/
https://www.zotero.org/trac/wiki/HierarchicalOntology

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