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SRU & CQL

SRU & CQL. Ralph LeVan Senior Research Scientist, OCLC levan@oclc.org Code4Lib Pre-Conference Brown University 23 February 2009. The Basics. REST-ful API for Search and Retrieve CQL – A rich, standardized query grammar Self-describing service through Explain records.

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SRU & CQL

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  1. SRU & CQL Ralph LeVan Senior Research Scientist, OCLC levan@oclc.org Code4Lib Pre-Conference Brown University 23 February 2009

  2. The Basics • REST-ful API for Search and Retrieve • CQL – A rich, standardized query grammar • Self-describing service through Explain records

  3. REST-ful API for Search and Retrieve • Base URL: http://worldcat.org/identities/search/Identities • Querystring: query=local.Name+all+%22ralph+levan%22 • Important Optional Parms: • startRecord • maximumRecords • recordSchema

  4. REST-ful API for Search and Retrieve • Untrustworthy Optional Parms: • sortKeys

  5. REST-ful API for Search and Retrieve • Amusing Parms: • recordPacking

  6. REST-ful API for Search and Retrieve • Omittable Mandatory Parms: • version • operation

  7. CQL • Standard Boolean operations • Search Terms: [Index relation] quotedString • query=dog • query=cql.any exact “moby dick” • Indexes defined by server • Standard relations: • exact, =, all, any

  8. searchRetrieveResponse • <?xml version="1.0" ?> • <?xml-stylesheet type="text/xsl" href="/identities/NameFinderResponse.xsl"?> • <searchRetrieveResponse xmlns="http://www.loc.gov/zing/srw/">

  9. searchRetrieveResponse elements • <version>1.1</version> • <numberOfRecords>3</numberOfRecords> • <resultSetId>6dsxzt</resultSetId> • <resultSetIdleTime>300</resultSetIdleTime> • <records><record></record>...</records> • <echoedSearchRetrieveRequest>... • <diagnostics>... • <extraResponseData>...

  10. record elements • <recordSchema> • info:srw/schema/1/Identities</recordSchema> • <recordPacking>xml</recordPacking> • <recordData>... • <recordPosition>1</recordPosition>

  11. Explain • <explainResponse xmlns="http://www.loc.gov/zing/srw/"> • <version>1.1</version> • <record> • <recordSchema> • http://explain.z3950.org/dtd/2.0/</recordSchema> • <recordPacking>xml</recordPacking> • <SRW:recordData>

  12. Explain Record • <explain authoritative="true" xmlns="http://explain.z3950.org/dtd/2.0/"> • <serverInfo protocol="SRW/U">… • <databaseInfo>… • <indexInfo>… • <schemaInfo>… • <configInfo>…

  13. indexInfo • <set identifier="http://staff.oclc.org/~levan/localContextSets/Identities" name="local"/> • <index> • <title>local.BirthDate</title> • <map> • <name set="local">BirthDate</name> • </map> • <configInfo> • <supports type='relation'>any</supports> • </configInfo> • </index>

  14. schemaInfo • <schema sort="false" retrieve="true" name="Identities" • identifier="info:srw/schema/1/Identities” • location="http://www.oclc.org/standards/Identities/schema/Identities.xsd"> • <title>Identities records in their native format</title> • </schema>

  15. configInfo • <default type="maximumRecords">250</default> • <default type="numberOfRecords">10</default> • <default type="retrieveSchema"> • info:srw/schema/1/Identities</default>

  16. Links • http://www.loc.gov/standards/sru/

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