Install jing by entering the following commands in the terminal:
sudo apt update sudo apt install jing
Description:
RELAX NG validator
This provides a validator for - RELAX NG 1.0 Specification, - RELAX NG Compact Syntax, and - parts of RELAX NG DTD Compatibility, specifically checking of ID/IDREF/IDREFS.
Homepage: https://github.com/relaxng/jing-trang
Version: 20151127+dfsg-1
Section: universe/text