条件XPath语句

Question

这是一段HTML，从中我想提取信息：

<li> 
    <p><strong class="more-details-section-header">Provenance</strong></p> 
    <p>Galerie Max Hetzler, Berlin<br>Acquired from the above by the present owner</p> 
    </li> 

我想有一个XPath表达式取决于是否有其提取第二<p> ... </p>的内容与<p> ... Provenance ... </p>

此之前，一个兄弟就是在那里我得到迄今：

if "Provenance" in response.xpath('//strong[@class="more-details-section-header"]/text()').extract(): 
      print("provenance = yes") 

但我怎么去Galerie Max Hetzler, Berlin<br>Acquired from the above by the present owner？

我试图

if "Provenance" in response.xpath('//strong[@class="more-details-section-header"]/text()').extract(): 
      print("provenance = yes ", response.xpath('//strong[@class="more-details-section-header"]/following-sibling::p').extract()) 

但我得到[]

Answer 1

您应该使用

//p[preceding-sibling::p[1]/strong='Provenance']/text()