files/en-us/web/xml/xslt/index.md
Extensible Stylesheet Language Transformations (XSLT) is an XML-based language used, in conjunction with specialized processing software, for the transformation of XML documents.
Although the process is referred to as "transformation", the original document is not changed; rather, a new XML document is created based on the content of an existing document. Then, the new document may be serialized (output) by the processor in standard XML syntax or in another format, such as HTML or plain text.
XSLT is most often used to convert data between different XML schemas or to convert XML data into web pages or PDF documents.
The XSLT reference provides detailed information about XSLT, including the available elements.
<xsl:stylesheet> or <xsl:transform> and instructions for templates.
It also briefly covers literal result elements (LREs), which copy non-instruction elements like <hr> directly to the output, and attribute value templates that use XPath expressions to set attribute values.The XSLT guides describe how to transform XML, how to use PI parameters, and common XSLT errors.
<?xml-stylesheet?> processing instruction. This is done using the <?xslt-param?> PI described in this document.