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The ADL Gazetteer & Thesaurus Service Protocols

The ADL Gazetteer & Thesaurus Service Protocols. Greg Janée gjanee@alexandria.ucsb.edu. Outline. Motivation ADL Gazetteer Protocol model, services, query language, relationships ADL Thesaurus Protocol model, services Summary. Motivation. Gazetteer more a service than a collection

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The ADL Gazetteer & Thesaurus Service Protocols

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  1. The ADL Gazetteer & Thesaurus Service Protocols Greg Janée gjanee@alexandria.ucsb.edu

  2. Outline • Motivation • ADL Gazetteer Protocol • model, services, query language, relationships • ADL Thesaurus Protocol • model, services • Summary

  3. Motivation • Gazetteer • more a service than a collection • streamlined, customized for gazetteers • Thesaurus • referenced by gazetteers and DLs • Style • lightweight protocols • buzzword-compliant

  4. * may be qualified asprimary and/or historical identifier “place” adlgaz-1-6450449-20 footprints* names* Willbridge North Portland Multnomah County • • • thesaurus reference feature classes* extended populated places <?xml... Oregon relationships • • • AdministrativePartOf ConventionallyQualifiedBy Gazetteer model

  5. Service characteristics • Stateless, independent, synchronous, optional • SOAP-like, XML-over-HTTP formulation • HTTP POST to common URL • Access control not addressed

  6. Services • get-capabilities() capabilities description • what thesauri, services, query types, etc., are supported • query(query, report format [, geometry lang])  reports • returns all entries that match a query • two report formats: standard, extended • geometry language (GML, ArcXML, …) negotiable • download(report format [, geometry language])  reports • downloads entire gazetteer • add-entry(report)  identifier • relate-entries(relationship, identifier1, identifier2) • remove-entry(identifier)

  7. Query language • Constraint types • identifier • find gazetteer entry #314159 • name • find placenames containing the phrase “San Diego” • footprint • find everything that overlaps a given region • class • find all cemeteries • relationship • find the capital of California • Booleans: AND, OR, AND NOT

  8. Relationships… • PartOf • AdministrativePartOf • AdministrativePartitionMemberOf • AdministrativeSeatOf • ConventionallyQualifiedBy • SubfeatureOf • GeophysicalPartitionMemberOf • PhysicallyConnectedTo • FlowsInto

  9. Relationships… and the protocol • Two semantically equivalent constraints • find place spatially within another place • find place PartOf another place • Behavior depends on implementation • Mandate equivalence?

  10. “concept” name canals preferred: notes extended Manmade waterway... <?xml... Thesaurus model hydrographic structures  BT/NT UF log rides USE (+) RT locks  amusement park rides  BT/NT freshwater canals 

  11. Services • get-properties()  properties • download(include-nonpreferred, format)  list • returns list of terms • three formats: brief, standard, extended • query(operator, text, fuzzy, format)  list • against term names • matching: word-based, equality, regular expression • get-broader(start-term, max-levels, format)  hierarchy • returns DAG of terms • get-narrower([start-term,] max-levels, fmt)  hierarchy • null start term yields whole thesaurus

  12. Issues • Identifiers • Multilingual thesauri

  13. Summary • ADL Gazetteer & Thesaurus Protocols • lightweight, stateless, complementary • based on XML, HTTP • Reference servers • generic, open source, J2EE-based • gazetteer server: maps to JDBC/SQL • thesaurus server: imports MultiTes • For more information • http://www.alexandria.ucsb.edu/gazetteer/protocol • http://www.alexandria.ucsb.edu/thesaurus/protocol

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