Riley, Jenn wrote:
> Change for 3.4 approved on April 8, 2009:
> - Add type="reviewOf" and type="references" to <relatedItem>. The committee recognized the need and opportunity to fundamentally change how relationship types are designated in MODS 4.0, but felt in the meantime 3.4 would benefit from the introduction of these two relationship types that have been specifically requested by MODS implementers.

Note that the relationships defined in FRBR will be registered in the 
NSDL metadata registry. A provisional version (because IFLA hasn't 
decided yet on what URI to use) is at:

Ideally, MODS could use URIs to indicate relationships when these become 


Karen Coyle / Digital Library Consultant
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