XPathReview.md

Top things we need to do with XPath

Consult resources:

• eXist-dB on newtfire
• Newtfire XPath Tutorial
• Obdurodon: XPath Functions we use the most

XPath steps

• Axes:
  • child::
  • attribute:: @
  • descendant:: // and .// in a predicate
  • self:: .
  • parent:: ..
  • ancestor::
  • preceding-sibling::
  • following-sibling::
  • preceding::
  • following::

Main Kinds of XML nodes to reach

• Element
• Attribute
• Document node(s)
• Comment (yes, you can XPath to your <!-- XML comments -->
• Processing-instruction (like your Relax NG schema line)

Writing predicate filters

• //node()[@type="something" ]
• //element[descendant::something/@type]