code: public DavChild getProps(final BasicHttpClient cl,
                             final String path,
                             final Collection<QName> props) throws Throwable {
      return makeDavChild(propfind(cl,
                                   normalizePath(path),
                                   props,
                                   depth0));
    }
docs: Return the DavChild element for the targeted node.
  
  @param cl http client
  @param path of resource
  @param props   null for a default set
  @return DavChild or null for not found
  @throws Throwable