The NASA Astrophysics Data System (ADS) currently provides free access to over 2.9 million records in four bibliographic databases through a sophisticated search interface. An increasingly larger number of publishers and institutions are using the ADS to verify the existence and availability of references published in the scientific literature. To facilitate the exchange of metadata necessary to establish these links, the ADS is developing prototype Web Services based on emerging industry standards such as SOAP as part of a collaboration with the major NASA Astrophysics Data Centers. In this paper we discuss possible approaches to the implementation of SOAP services and present three different prototypes developed by the ADS group as our contribution to this effort. We conclude with a brief discussion of the issues still confronting data providers and software developers as we embrace these new technologies.
Astronomical Data Analysis Software and Systems XII
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