Changes between Version 12 and Version 13 of Discovery/DiscoveryWebServiceMEDIN


Ignore:
Timestamp:
06/11/09 09:59:30 (10 years ago)
Author:
mpritcha
Comment:

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  • Discovery/DiscoveryWebServiceMEDIN

    v12 v13  
    8989Although 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. 
    9090 
    91 The doSearchRequest message is shown in schema form in fig X (click image to enlarge).  
     91The doSearchRequest message is shown in schema form below (click image to enlarge): 
    9292 
    9393[[Image(doSearchSchema.png, 400px)]] 
     
    300300   Target is entries in the discovery index database corresponding to parameter keywords extracted from the metadata. 
    301301 
    302 '''MEDINTermTarget#1*''':: 
    303    Target is entry in the discovery database corresponding to the 'MEDINTermTarget#1''' field in the MEDIN metadata format. (*It has been agreed that the search capability will be extended to support direct searching of a limited number of target fields within the MEDIN metadata format. List of fields currently to be confirmed by MEDIN). 
     302'''MEDINTermTarget.1*''':: 
     303   Target is entry in the discovery database corresponding to the '''MEDINTermTarget.1''' field in the MEDIN metadata format. (*It has been agreed that the search capability will be extended to support direct searching of a limited number of target fields within the MEDIN metadata format. List of fields currently to be confirmed by MEDIN). 
     304 
     305=== presentFormatList === 
     306=== orderByFieldList === 
     307=== scopeList === 
     308=== spatialOperatorList === 
     309=== spatialReferenceSystemList === 
     310=== dateRangeTargetList === 
     311=== temporalOperatorList === 
     312=== metadataFormatList === 
     313=== recordDetailList ===