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So, how compatible is Subversion with other DeltaV software? In two words: not very. At least, not in Subversion 1.0.
While libsvn_ra_dav sends DeltaV requests to the server, the Subversion client is not a general-purpose DeltaV client. In fact, it expects some custom features from the server (especially through custom REPORT requests). Further, mod_dav_svn is not a general-purpose DeltaV server. It only implements a strict subset of the DeltaV specification. A more general WebDAV or DeltaV client may very well be able to interoperate against it, but only if that client operates within the narrow confines of those features that the server has implemented. The Subversion development team plans to address general WebDAV interoperability in a future release of Subversion.