code: @Nonnull
    public CSSExpression addURI (@Nonnull @Nonempty final String sURI)
    {
      return addMember (new CSSExpressionMemberTermURI (sURI));
    }
docs: Shortcut method to add a URI value
  
  @param sURI
  The value to be added. May neither be <code>null</code> nor empty
  @return this