libxslt

This C library allows you to transform XML files into other XML files
(or HTML, text, and more) using the standard XSLT stylesheet
transformation mechanism.
It is based on libxml (version 2) for XML parsing, tree manipulation,
and XPath support. It is written in plain C, making as few assumptions
as possible and sticks closely to ANSI C/POSIX for easy embedding.
It includes support for the EXSLT set of extension functions as well
as some common extensions present in other XSLT engines.

          

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License: GPL-2.0-or-later AND MIT
URL: http://xmlsoft.org/XSLT/