code: @Nonnull
    public static XPath createNewXPath (@Nonnull final XPathFactory aXPathFactory,
                                        @Nullable final XPathFunctionResolver aFunctionResolver)
    {
      return createNewXPath (aXPathFactory, (XPathVariableResolver) null, aFunctionResolver, (NamespaceContext) null);
    }
docs: Create a new {@link XPath} with the passed function resolver.
  
  @param aXPathFactory
  The XPath factory object to use. May not be <code>null</code>.
  @param aFunctionResolver
  Function resolver to be used. May be <code>null</code>.
  @return The created non-<code>null</code> {@link XPath} object