Catalog and Browse: The catalog contains information about all the participants in the dataspace and the relationships among them. The catalog must be able to accommodate a large variety of sources and support differing levels of information about their structure and capabilities. Wherever possible, the catalog should contain a basic inventory of the data elements at each participant: identifier, type, creation date and so forth.
Search and Query: The component should offer the following capabilities: query everything, structured query, meta-data queries, monitoring.
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