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A growing number of astronomical resources and data or information
services are made available through the Internet.
However valuable information is frequently hidden
in a deluge of non-pertinent or non up-to-date documents.
At a first level, compilations of
astronomical resources provide
help for selecting relevant sites.
Combining yellow-page
services and meta-databases of active pointers may be
an efficient solution to the data retrieval problem.
Responses generated
by submission of queries
to a set of heterogeneous resources are
difficult to merge or cross-match, because
different data providers generally
use different data formats: new endeavors are under way
to tackle this problem.
We review the technical challenges involved
in trying to provide general search and discovery
tools, and to integrate them through upper
level interfaces.
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