Remove href from ordering when member is removed from collection
Add href to ordering when member is added to collection
- At requested position if Position header is used
- At end of ordering otherwise
Verify values of DAV:ordering submitted with PROPPATCH
Respond to PROPFIND with ordered listing if collection is ordered
If the PROPPATCH request doesn’t follow the rules (each collection member must be in the ordering exactly once, no hrefs in the ordering for resources that are not collection members), the request MUST fail.