Enum to direct XPathVisitor when to tweak the XPath query to suit the nature of the document being searched. Note that searches for CSS selectors from a Nokogiri document, fragment, or node will choose the correct option automatically.
© 2008–2018 Aaron Patterson, Mike Dalessio, Charles Nutter, Sergio Arbeo,
Patrick Mahoney, Yoko Harada, Akinori MUSHA, John Shahid, Lars Kanis
Licensed under the MIT License.
https://nokogiri.org/rdoc/Nokogiri/CSS/XPathVisitor/DoctypeConfig.html