This document defines the EPN-TAP framework, which is using TAP with the EPNCore metadata dictionary. The EPNCore metadata dictionary defines the core components that are necessary to perform data discovery in the Solar System related science fields. It includes parameters to describe data products coverage (temporal, spectral, spatial, photometric), origin (instrument, facility), content (target, physical parameters), access, references, etc. Its implementation with TAP (Table Access Protocol) is presented, including service registration guidelines. Topical extension metadata dictionaries are also presented.