This directory used to host various material of the IVOA semantics WG. This has now, for better or worse, all moved to github. See: https://github.com/ivoa-std/VEPs for version-controlled VEPs https://github.com/ivoa-std/vocinfo for the standard https://github.com/ivoa-std/Vocabularies for the vocabularies themselves (which is mainly there for the vocabulary maintainers)