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A growing number of astronomical resources and data or information servicesare made available through the Internet. However valuable information isfrequently hidden in a deluge of non-pertinent or non up-to-date documents. Ata first level, compilations of astronomical resources provide help forselecting relevant sites. Combining yellow-page services and meta-databases ofactive pointers may be an efficient solution to the data retrieval problem.Responses generated by submission of queries to a set of heterogeneousresources are difficult to merge or cross-match, because different dataproviders generally use different data formats: new endeavors are under way totackle this problem. We review the technical challenges involved in trying toprovide general search and discovery tools, and to integrate them through upperlevel interfaces.Comment: 7 pages, 2 Postscript figures; to be published in A&A

Search and discovery tools for astronomical on-line resources and services