DAV_COPY copies the resource or collection taken from path to the destination.
  returns COL_ID or RES_ID on success.DAV_MOVE moves the collection or resource to the destination path
  returns 1 on success.DAV_PROP_SET defines or updates the property with name @propname@
    with propvalue. Returns PROP_ID on success.DAV_PROP_REMOVE removal of the existing property on target path.
    If silent supplied then no error will be returned.