IVOA Recommendation: Resource Metadata for the Virtual Observatory Version 1.12
Robert Hanisch, the IVOA Resource Registry Working Group, the NVO, Metadata Working Group

TL;DR
This paper defines a standardized architecture and initial set of metadata concepts for describing data and services in the Virtual Observatory, facilitating data discovery and efficient query management.
Contribution
It introduces a formal architecture for resource metadata in the Virtual Observatory and aligns it with emerging Web Services standards.
Findings
Proposes a metadata architecture for VO resources
Defines initial metadata concepts for data and services
Enhances data discoverability and query efficiency in VO
Abstract
An essential capability of the Virtual Observatory is a means for describing what data and computational facilities are available where, and once identified, how to use them. The data themselves have associated metadata (e.g., FITS keywords), and similarly we require metadata about data collections and data services so that VO users can easily find information of interest. Furthermore, such metadata are needed in order to manage distributed queries efficiently; if a user is interested in finding x-ray images there is no point in querying the HST archive, for example. In this document we suggest an architecture for resource and service metadata and describe the relationship of this architecture to emerging Web Services standards. We also define an initial set of metadata concepts.
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