Proton and Neutron Knowledge Organisation System
The interesting stuff is in the PanKOS/Version_1.0/ directory. Here you will find the source files in owl, rdf and ttl formats and pdf documentation. Since much of the html in this contains broken links, I created new html rendering. It is in the docs/ directory or online here:
https://ral-facilities.github.io/pankos/
License: CC-BY 4.0