Changes between Version 6 and Version 7 of Discovery/DiscoveryWebServiceMEDIN


Ignore:
Timestamp:
06/11/09 09:06:13 (10 years ago)
Author:
mpritcha
Comment:

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  • Discovery/DiscoveryWebServiceMEDIN

    v6 v7  
    9393The doSearch operation performs a search against the NDG discovery database. Queries to this database are formulated from the doSearchRequest message, and forwarded to the database via private methods (i.e. the consumer of the web service is not able directly to interact with the database). 
    9494 
    95 Although outside the scope of the Discovery web service itself, it is worth explaining the structure of the NDG Discovery database which is searched by the service. This is populated from records harvested via [http://www.openarchives.org/pmh/ OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting)] from collaborating data providers. Records are currently harvested the ISO19115-compliant metadata format agreed by the NERC Metadata Standards Working Group (currently DIF v9.4, soon to be MEDIN ISO v2.3.x), and are tagged at ingest time with one or more "scope" keywords (listed in the scopeList list available from the getList operation). These enable the search to be restricted to particular communities, namely NERC, NERC_DDC (Designated Data Centres) and MDIP (Marine Environmental Data Information Network, formerly Marine Data Information Partnership). Limited quality control on ingested records is also applied at ingest time, but it is the responsibility of the data provider to ensure that metadata records are provided to sufficient quality to enable them to be visible in the system. 
     95Although outside the scope of the Discovery web service itself, it is worth explaining the structure of the NDG Discovery database which is searched by the service. This is populated from records harvested via [http://www.openarchives.org/pmh/ OAI-PMH (Open Archives Initiative Protocol for Metadata Harvesting)] from collaborating data providers. Records are harvested in the ISO19115-compliant metadata format agreed by the NERC Metadata Standards Working Group (MEDIN ISO v2.3.1) with legacy support for the previous format (DIF v9.4), and are tagged at ingest time with one or more "scope" keywords (listed in the scopeList list available from the getList operation). These enable the search to be restricted to particular communities, namely NERC, NERC_DDC (Designated Data Centres) and MEDIN (Marine Environmental Data Information Network). Limited quality control on ingested records is also applied at ingest time, but it is the responsibility of the data provider to ensure that metadata records are provided to sufficient quality to enable them to be visible in the system. 
    9696 
    9797The doSearchRequest message is shown in schema form in fig X.