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“SRU/W – Interfaces to your Repository –What is it?” CONZUL Symposium Kristian Thornley Web Applications Developer: eLearning & Web Support Unit CPIT, May 2007 SRU/W ??? Search and Retrieve via URL or Web Service Warning Some More Acronyms… SRU via URL implemented as a RESTful Service

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slide1

“SRU/W – Interfaces to your Repository –What is it?”CONZUL SymposiumKristian ThornleyWeb Applications Developer: eLearning & Web Support UnitCPIT, May 2007

sru w
SRU/W ???
  • Search and Retrieve via URL or Web Service
  • Warning Some More Acronyms…
  • SRU via URL implemented as a RESTful Service
    • No protocol envelope = lower overhead
    • Human(ish) readable (e.g…)
    • Easier to transform via XSLT
  • SRW via Web Service implemented as a SOAP Service
    • (More) Machine readable (e.g…)
    • Complex data structures defined/enforced by XSD
    • Easier to parse via Programming Language
history
History
  • Specification developed and maintained at the Library of Congress
  • Derived from Z39.50
  • Platform Independent
sru w vs oai pmh
SRU/W vs. OAI-PMH
  • Each has their own role
  • SRW/U
    • Searching rather than harvesting
    • Complex queries via CQL
    • End-user Application Interface
  • OAI-PMH
    • Runs in the background
    • OAI-PMH specification/selection limited to sets and date ranges
  • Creates synergy when coupled
example sru w over oai pmh

Researcher

Example SRU/W over OAI-PMH

Institution C

Institution B

Institution A

A

?

B

B

C

A

C

D

D

example sru w over oai pmh6

Researcher

Example SRU/W over OAI-PMH

Institution C

Institution B

Institution A

B

C

A

D

HTMLPage

OAI-PMH

OAI-PMH

SRU/W

dc:creator = “Bloggs, J”

srw u operations
SRW/U Operations
  • explain request
    • Like OAI-PMH Identify
    • Wraps a ZeeRex Message describing the Database
  • searchRetrieve request
    • The guts of the protocol
  • scan request (not implemented.. yet)
    • Summarises possible search terms and expected hits returned if executed
features of the searchretrieve request
Features of the searchRetrieve Request
  • query (required)
    • Main component encapsulated CQL (Common Query Language) more on this later…
    • Must be URL encoded in SRU
  • version (required)
    • Current 1.1
  • maximumRecords, startRecord
    • Pagination support
  • recordPacking
    • String or XML
  • recordSchema
    • How should the results be presented (DC,QDC,MODS…)
  • stylesheet
    • Post-request XSL Transformation (e.g…) (only available in SRU)
slide9
CQL
  • Another Acronym…
  • Requests vary from simple
    • dc:title = test
  • To complex
    • ((dc:title = “test”) OR (dc:identifier contains “test”) NOT dc:creator = “test”
  • Allows mix and match
    • mods:titleInfo = “test” OR dc:title = “test”
  • Varied levels of conformance
    • Levels 0 – 2 (current level is 1)
    • Level 2 includes:
      • Proximity, context sets, xquery, sort etc…
ok how do we use it
OK how do we use it…
  • Use “Classic” Web site interface
    • http://harvester.oarinz.ac.nz/index.php/oarinzsearch/html
  • Implement pre-built client
    • http://harvester.oarinz.ac.nz/index.php/about
  • Develop your own
    • Lots of languages have libraries that make it easy e.g. C#, Java, PHP, Python, Perl
some examples
Some Examples
  • http://harvester.oarinz.ac.nz/plugins/generic/pkpsruclient/flash/queryBuilder1.2.swf
  • MS Office integration