XML XPath
The XML Path (XPath) language is a query language for XML documents, developed by the W3 consortium.
XPath provides users with a non-XML-based syntax that allows them to point to elements in an XML document.
XPath is mainly used in XSLT, but can also be used as a much more powerful way of navigating through the DOM of any XML-like language document such as HTML and SVG.
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You can learn more about XPath in our XML XPath Tutorial