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Catalogue services (CAT) support the ability to publish and
search collections of descriptive information(metadata) for data,
services, and related information objects. Metadata in catalogues
represent resource characteristics that can be queried and
presented for evaluation and further processing by both humans
and software. Catalogue services are required to support the
discovery and binding to registered information resources within
an information community.
CAT specifies the interfaces between clients and catalogue
services, through the presentation of abstract and
implementation-specific models. CGDI registries will be based on
CAT. For most registries, CAT will require the development of
specific profiles before it can be used.
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