Photon and Neutron Experimental Techniques: An ontology of techniques within the photon and neutron (PaN) domain.PurposeThe main purpose of this ontology is to provide a controlled vocabulary, global PIDs and annotations for photon and neutron techniques, to support PaN FAIR data catalogue functionality.Design philosophyIn this simple ontology everything is a class and all classes are techniques. Object property relationsare implied but not formalized in this version. Subclass/superclass relationships and intersections are used to define specific technique classes in terms of broader superclasses. This is seen as a keyrequirement in order to carry out catalogue searcher for broader concepts, for example.This project was undertaken under ExPaNDS WP3.2 (https://expands.eu/)The ontology is can be found here: https://github.com/ExPaNDS-eu/ExPaNDS-experimental-techniques-ontologyPhoton and neutron PaN ontologies developed under ExPaNDS are documented here: https://doi.org/10.5281/zenodo.4806026