YaPPI is an XML database of particle properties. It is a part of the open source FreeHEP Java Library.
What is YaPPI?
YaPPI is an XML database of particle properties, accessible through a Java API. The goal is to provide particle property data to physicists' analysis programs in a way that is independent of platform, environment, or analysis package being used. Available components of YaPPI include:
The implementation was created by Patrick Hellwig as Summer Student at CERN in 2000 and is currently maintained by Mark Dönszelmann and Tony Johnson at SLAC.