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may involve learning and using several different search tools to execute the requisite space-time queries.
 
may involve learning and using several different search tools to execute the requisite space-time queries.
 
To address this issue, the ESIP federation is developing a federated space-time query framework, based on the OpenSearch convention (www.opensearch.org), with Geo and Time extensions.
 
To address this issue, the ESIP federation is developing a federated space-time query framework, based on the OpenSearch convention (www.opensearch.org), with Geo and Time extensions.
In this framework, data providers publish OpenSearch Description Documents that describe in a machine-readable form how to execute queries against the provider. The novelty of OpenSearch is that the space-time query interface becomes both machine callable and easy enough to integrate into the web browser's search box.
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In this framework, data providers publish OpenSearch Description Documents that describe in a machine-readable form how to execute queries against the provider.
This flexibility, together with a simple REST (HTTP-get) interface, should allow a variety of data providers to participate in the federated search framework, from large institutional data centers to individual scientists. The simple interface enables trivial querying of multiple data sources and participation in recursive-like federated searches--all using the same common OpenSearch interface.
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This flexibility, together with a simple HTTP-get mechanism, should allow a variety of data providers to participate in the federated search framework, from large institutional data centers to individual scientists.
 
This simplicity also makes the construction of clients easy, as does existing OpenSearch client libraries in a variety of languages.  Moreover, a number of clients and aggregation services already exist and OpenSearch is already supported by a number of web browsers such as Firefox and Internet Explorer.
 
This simplicity also makes the construction of clients easy, as does existing OpenSearch client libraries in a variety of languages.  Moreover, a number of clients and aggregation services already exist and OpenSearch is already supported by a number of web browsers such as Firefox and Internet Explorer.
  

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