What is WebDAV and DeltaV

* WebDAV: RFC 2518. Extends the standard HTTP methods to make web servers behave as traditional fileservers, complete with a locking model and meta-data properties.
* DeltaV: RFC 3253. Adds more HTTP methods to WebDAV, introducing versioning concepts. Provides a number of flexible versioning models that servers can support, and some backwards-compatibility modes for older WebDAV or HTTP/1.1 clients.