This document defines the use and development of interoperable vocabularies (i.e., lists of commonly-understood terms including labels, descriptions, and a small set of relationships between these terms) in the Virtual Observatory_.

Stable versions of this document are available through the IVOA document repository_.

To build a PDF version this document, you will need a reasonably complete LaTeX installation, a sufficiently capable make, preferably latexmk and probably rsvg-convert. For further details, see ivoatexDoc_.

This document is distributed under CC-BY-SA.

.. _rsvg-convert: https://wiki.gnome.org/Projects/LibRsvg .. _latexmk: https://personal.psu.edu/~jcc8/software/latexmk/ .. _IVOA document repository: http://ivoa.net/documents/ .. _ivoatexDoc: https://ivoa.net/documents/Notes/IVOATex/ .. _Virtual Observatory: https://ivoa.net

There was a previous major version of this document that does not share history with this version. Its sources are still available through volute_.

.. _through volute: https://volute.g-vo.org/svn/trunk/projects/semantics/attic/.