https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0013864
Security Bulletin: Security Vulnerabilities in Apache FOP and Apache Batik affect HCL Portal...
XML external entity (XXE) security vulnerabilities in Apache FOP and Apache Batik affect HCL Portal (CVE-2017-5661,
security bulletinapache fopvulnerabilitiesbatikaffect
https://www.oxygenxml.com/doc/versions/28.1/ug-editorEclipse/topics/xsl-fo-processors.html
XSL-FO (Apache FOP) Processor for Generating PDF Output
The Oxygen XML Editor Eclipse plugin installation package is distributed with the Apache FOP that is a Formatting Objects processor for transforming your XML...
xsl foapache fopprocessorgeneratingpdf