VOA Recommendation: An IVOA Standard for Unified Content Descriptors Version 1.1

Sebastian Derriere, Gray Norman, Robert Mann, A. Preite Martinez, McDowell Jonathan, McGlynn Thomas, Oschenbein Francois, P. Osuna, Guy Rixon, Williams Roy

Research output: Other contribution

Abstract / Description of output

This document describes the current understanding of the IVOA controlled vocabulary for describing astronomical data quantities, called Unified Content Descriptors (UCDs). The present document defines a new standard (named UCD1+) improving the first generation of UCDs (hereafter UCD1). The basic idea is to adopt a new syntax and vocabulary requiring little effort for people to adapt softwares already using UCD1. This document also addresses the questions of maintenance and evolution of the UCD1+. Examples of use cases within the VO, and tools for using UCD1+ are also described.
Original languageEnglish
Number of pages14
Publication statusPublished - 2011

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