I’m using XPath with the lxml module of Python, and have the following xml code.

<library>
  <section1>
    <book>
      <title>Harry Potter</title>
      <author>J.K. Rowling</author>
    </book>
  </section1>
  <section2>
    <book>
      <title>Sapiens</title>
      <author>Yuval Noah Harari</author>
    </book>
  </section2>
</library>

Say I have some title nodes got from lxml’s .xpath method. How do I check if some of them has a section1 ancestor which is a child of the library root node?