IVOA Recommendation: VOResource: an XML Encoding Schema for Resource   Metadata Version 1.03
  This document describes an XML encoding standard for IVOA Resource Metadata, referred to as VOResource. This schema is primarily intended to support interoperable registries used for discovering resources; however, any application that needs to describe resources may use this schema. In this document, we define the types and elements that make up the schema as representations of metadata terms defined in the IVOA standard, Resource Metadata for the Virtual Observatory [Hanicsh et al. 2004]. We also describe the general model for the schema and explain how it may be extended to add new metadata terms and describe more specific types of resources. 
Raymond Plante, Kevin Benson, Matthew Graham, Gretchen Greene, Paul   Harrison, Gerard Lemson, Tony Linde, Guy Rixon, Aureli...
astro-ph.IM