(defun url-dav-lock-resource (url exclusive &optional depth)
"Request a lock on URL. If EXCLUSIVE is non-nil, get an exclusive lock.
Optional 3rd argument DEPTH says how deep the lock should go, default is 0
-\(lock only the resource and none of its children\).
+\(lock only the resource and none of its children).
Returns a cons-cell of (SUCCESSFUL-RESULTS . FAILURE-RESULTS).
SUCCESSFUL-RESULTS is a list of (URL STATUS locktoken).