WebDAV properties & namespace

I work on a WebDAV server.  Looking at requests from LibreOffice
[3.4.5.5-4.5.1 on openSUSE 12.1] I see requests for properties in the
"http://ucb.openoffice.org/dav/props/"; namespace.  But the only places I
can find mention of this namespace are:

<http://code.google.com/p/sabredav/wiki/OpenOffice>
<http://www.openoffice.org/ucb/docs/ucp-ref/webdav-ucp.html>

Is there any documentation for the 'format' of these properties?  What
the client expects?

And the property I see requested "IsReadOnly" is not listed on the
openoffice.org page.  

I'd like to support these properties, especially IsReadOnly [since that
one is frequently requested].  But there is no documentation on what a
proper response looks like.

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