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A Java implementation of XProc: An XML Pipeline Language
This project is now abandoned in favour of MorganaXProc-III which implements XProc 3.0: https://sourceforge.net/projects/morganaxproc-iiise/
MorganaXProc is a full implementation of XProc: An XML Pipeline Language (W3C Recommendation 11 May 2010) written in Java, supporting all required and optional steps, the steps proposed on EXProc.org and also the document templating steps "p:in-scope-names" and "p:template".
XPath 2.0 or XPath 3.0 is used as expression language.
XSLT and XQuery...
...It supports SSL/TLS, comes with local and remote userbase and statistics capabilities (via rmi over ssl),
an extensive permission system, event logging and supports "zipscripts" like pzs-ng.
Relaxed is an HTML validation app. as well as a XHTML 1.0 / HTML 4.01 and WCAG 1.0 schema definition written in Relax NG with embedded Schematron. Those expressive languages allow automated validation of many additional restrictions inexpressible by DTD.