The first attempt (as an ESAVO-SVO collaboration) to define such a protocol was TSAP (Theoretical Spectral Access Protocol), designed to access theoretical spectra. Now TSAP is part of the SSAP protocol as a Use Case.
TSAP metadata interface to the models: (links point to the first TSAP dialog step: the format=metadata one. Subsequent queries can be made using this information)
An ESA-VO tool able to handle Spectra in the VO context as well as providing analysis capabilities and easy integration of spectra coming from different data providers, wavelengths, and different metadata
accesses theoretical spectra in the VO allowing to compare them with observed data.
a web application developed using VO resources to fit observational data with theoretical models to infer physical properties for the observed objects.
uses TSAP to access several theoretical spectra collections and synthetic photometry corresponding to those spectra and find the best fit for observed photometry.