通过xpath选择多个索引的更好方法

Question

我尝试在复杂的表结构中选择"tr"内的多个"td".

$name = $sxml->xpath("
                //table[@cellspacing=0 and @cellpadding=2 and @class='mn2']
                    /tr[not(contains(@class, 'mn'))]/td[2] 
                | 
                //table[@cellspacing=0 and @cellpadding=2 and @class='mn2']
                        /tr[not(contains(@class, 'mn'))]/td[5]
                |
                //table[@cellspacing=0 and @cellpadding=2 and @class='mn2']
                        /tr[not(contains(@class, 'mn'))]/td[7]
                ");

一切都很好,我得到了我想要的东西,但这似乎有点矫枉过正.如何选择多个"td",如"td [2,5,7]",而不是使用Union表达式"|" ？

Answer 1

它可以在以下帮助下完成or:

//table[@cellspacing=0 and @cellpadding=2 and @class='mn2']
    /tr[not(contains(@class, 'mn'))]/td[position()=2 or position()=5 or position()=7]