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Paper: Structured Query Language for Virtual Observatory
Volume: 347, Astronomical Data Analysis Software and Systems XIV
Page: 262
Authors: Shirasaki, Y.; Ohishi, M.; Mizumoto, Y.; Tanaka, M.; Honda, S.; Oe, M.; Yasuda, N.; Masunaga, Y.
Abstract: Currently two query languages are defined as standards for the Virtual Observatory (VO). Astronomical Data Query Language (ADQL) is used for catalog data query and Simple Image Access Protocol (SIAP) is for image data query. As a result, when we query each data service, we need to know in advance which language is supported and then construct a query language accordingly. The construction of SIAP is simple, but it has a limited capability. For example, there is no way to specify multiple regions in one query, and it is difficult to specify complex query conditions. In this paper, we propose a unified query language for any kind of astronomical database on the basis of SQL99. SQL is a query language optimized for table data, so to apply SQL to image and spectral data, the data structures need to be mapped to table-like structures. We present a specification of this query language and an example of the architecture for the database system.
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