Paper:	The XCATDB: a Complex Database Based on Saada
Volume:	376, Astronomical Data Analysis Software and Systems XVI
Page:	699
Authors:	Motch, C.; Michel, L.; Pineau, F.X.
Abstract:	The Survey Science Center (SSC) of the XMM-Newton satellite provides a public interface to the European Photon Imaging Counter (EPIC) source catalogs implementing cross-correlations between EPIC X-ray sources and archival astronomical catalogs. These cross-correlations are computed by the Archival Catalog Database Subsystem (ACDS), developed in Strasbourg, as part of the automatic pipeline processing. A first release of this database (the XCATDB) based on an obsolete OODBMS was made public with the 1st XMM-Newton catalog in 2003. A new system, based on Saada, will be made public at the time of the 2nd release of the catalog in late 2006. Saada is well-suited to host heterogeneous data and especially to manage persistent relationships. This last feature is used to implement in a static manner the correlations computed by the ACDS. The Saada query language (SaadaQL) can express very complex constraints and can select X-ray sources using conditions on the patterns formed by the correlation links. SaadaQL also supports constraints based on Unified Content Descriptors (UCDs) allowing selections on multiple catalogs. The demonstration includes a presentation of the XCATDB prototype and is focused on the SaadaQL features and the use of UCDs to handle heterogeneous datasets.

Astronomical Society of the Pacific
Conference Series

© Copyright 1988 - 2024 - Astronomical Society of the Pacific
No part of the material protected by this copyright may be reproduced or used in any form other than for personal use without written permission from the ASP.

Page generated in 0.073 seconds