What is Subversion's client/server interoperability policy?

The client and server are designed to interoperate as long as they are not more than one major release version apart. For example, any 1.X client will work with a 1.Y server. However, if the client and server versions don't match, certain features may not be available.

The client/server interoperability policy is documented in the Compatibility section of the Hacker's Guide to Subversion.