Automatically creates an XML request body if TAG is non-nil.
BODY is the XML document fragment to be enclosed by <TAG></TAG>.
-DEPTH is how deep the request should propogate. Default is 0, meaning
+DEPTH is how deep the request should propagate. Default is 0, meaning
it should apply only to URL. A negative number means to use
`Infinity' for the depth. Not all WebDAV servers support this depth
though.