การค้นหาข้อมูลจากเอกสาร xml
XPath

XPath is a language for finding information in an XML document. XPath is used to navigate through elements and attributes in an XML document.

XPath is a major element in the W3C's XSLT standard - and XQuery and XPointer are both built on XPath expressions.

So an understanding of XPath is fundamental to a lot of advanced XML usage.

Example
- http://www.codeproject.com/soap/myXPath.asp