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Web Services Overview

Web Services Overview. Thomas Hickey. What are Web Services?. Machine-to-machine communication Run over standard Web protocols XML syntax, HTTP packaging Several approaches REST Representational State Transfer SOAP Simple Object Access Protocol. REST. REST is simplest

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Web Services Overview

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  1. Web Services Overview Thomas Hickey

  2. What are Web Services? • Machine-to-machine communication • Run over standard Web protocols • XML syntax, HTTP packaging • Several approaches • REST • Representational State Transfer • SOAP • Simple Object Access Protocol

  3. REST • REST is simplest • Send an HTTP request • Get back a response (XML, HTML) • Examples • Web browser • OpenURL • Z39.50 as a Web service: SRU http://sfx.bath.ac.uk/sfxmenu?genre=book&isbn=1234-5678 http://www.kb.nl/ cgi-zoek/srw.pl?query=test&maxRec=10&recSchema=dc_record

  4. REST: OAI-PMH • Now in version 2.0 • Allows synchronization of databases • Other services can be layered • ODL: Open Digital Libraries • XTCat name authority service

  5. SOAP is more complex • Simple Object Access Protocol • Z39.50 as a SOAP service: SRW • http://www.loc.gov/z3950/agency/zing/srwu/wsdl/zing_srw_binding.wsdl • WSDL • UDDI

  6. Classes of Services • Register • Search • Resolve • Navigate • Decompose • Enhance • Transform

  7. Registration Services • Metadata about metadata • Dublin Core extensions • Digital format descriptions • Metadata about objects • Books • Web resources • Metadata about agents • People • Institutions

  8. Search Services • Go from data to links • Name to preferred form • Search terms to record list

  9. Resolution Services • From links to data • Record numbers to records • Controlled names to name metadata • Class number to textual description

  10. Navigation Services • Movement within hierarchies • Classification, e.g. DDC • FRBR (work, expression, manifestation, item) • General network movement • Link selection and following

  11. Decomposition Services • DDC Numbers • Names within a list • Citations within a paper • Structure of a document • Letters within an image

  12. Enhancement Services • Normalization • Linkage to registered forms • Addition of DDC numbers • Authority control on agents • Content augmentation • Add information to a brief record from a matching longer record

  13. Transformation Services • Syntax translation • MARC21 to MARC XML • Semantic translation • Qualified Dublin Core to MARC21 • Library of Congress SH to FAST • Content translation • English to French?

  14. An Example: ePrints UK • Records harvested from archives • Web services to enhance metadata

  15. Personal e-print archives Institutional e-print archives Non-institutional e-print archives OAI-PMH Subject Classification Service e-Prints UK SOAP Name Authority Service SOAP HTTP Z39.50 RDN Gateway/portal Service Citation Analysis Service RDN Gateway/portal Service RDN Gateway/portal Service

  16. Web Services for ePrints UK • Personal name authorities • Subject classification • Citation analysis

  17. Example: XTCat • Union catalog of thesis and dissertation metadata • Records extracted from WorldCat • Available via OAI-PMH • Separate ‘set’ for electronic theses • We harvest from other repositories • Integrate with existing records • Allow re-harvesting (e.g. by VTLS)

  18. Issues • Syntax • Semantics • Content

  19. No one promised us tomorrow Hawaiian proverb

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