Theme source code is available here: https://github.com/Vitaliy-1/oldGregg/tree/master
Demonstration instance is available here: http://ojsdemo.e-medjournal.com/index.php/oldGregg/index
The theme uses built-in JATS Parser Plugin for rendering articles in JATS XML format and display on article landing page. An example can be seen here: http://ojsdemo.e-medjournal.com/index.php/oldGregg/article/view/4
To look at source JATS XML one needs just to download article’s
XML galley. JATS XML should be downloaded as a galley file as usual.
Another feature is displaying 20 most recent articles on journal’s homepage.
It is compatible with latest OJS 3 release (may not work if version is below 3.1). For bugs, please fill in an issue on GitHub page.
Please note that theme is lincensed under GPL. It was developed by me (and I’m not from PKP team).
Edit: the theme is ready for production use. Many thanks to @anupent for testing and proposing code modifications.