XSLT

(eXtensible Stylesheet Language Transformation) Software that converts an XML document into another format such as HTML, PDF or text. It may also be used to convert one XML document to another XML document with a different set of XML tags (different schema).

The XSLT Processor
Conversion is accomplished by the "XSLT processor," which transforms the input based on XSLT rules and XSL stylesheet codes. The XSLT processor uses an "XML parser" to separate the XML elements in the original document into a tree structure before it performs the conversion.

Xpath is another XSL tool that may be used in conjunction for identifying input, calculating numbers and manipulating characters. See XSL, DOM and SAX.

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XSLT - Extensible Stylesheet Language Transformations