Metafor is going to change the format of the output XML.

Instead of
<CIMRecordSet>
   <CIMRecord>
    <blah>
   </CIMRecord>
</CIMRecordSet>

They plan to have just

<CIMDocumentSet>
   <blah>
</CIMDocumentSet>

I don't know how much our harvester code is dependent upon these tags being in place

I don't know when this will take effect but they would like to do it for CMIP5.