The Simple Line Access Protocol (SLAP) is an IVOA standard for querying spectral line data collections through a uniform interface. Its version 2 is currently being defined in collaboration with the VAMDC consortium, providing a greater interoperability between the two infrastructures.

The latest draft of the standard has been presented at the IVOA Interop conference in Strasbourg in June 2026 by Nicolas Moreau (Paris Observatory, LUX).
You can access the program here and the presentation here.