Another important application of XML is data operation.
For data operations, a basic concept is XPath. XPath is a language that represents the elements in the XML document or another XML document, etc., based on XML, based on XML Relatively and convenient reference to related content, use the Dongdong like XSLT.
Why have this language? Because the data represented by the XML document is interrelated, it is not a separate one element and document, XPath and other languages make many advanced operations simple to complete.
