Xalan (named after a rare musical instrument) fully implements the W3C
Recommendation 16 November 1999 XSL Transformations (XSLT) Version 1.0
and the XML Path Language (XPath) Version 1.0. XSLT is the first part
of the XSL stylesheet language for XML. It includes the XSL Transformation
vocabulary and XPath, a language for addressing parts of XML documents.

Homepage:
https://xml.apache.org/xalan-j/
