A busy persons introduction to OAI-PMH Christopher Gutteridge ALT, April 2003.

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Presentation transcript:

A busy persons introduction to OAI-PMH Christopher Gutteridge ALT, April 2003

What is OAI-PMH The Open Archives Initiative Protocol for Metadata Harvesting A way of asking an archive about the stuff its got in it. This allows services to provide searches and other functionality across the metadata from many archives.

What Questions can you ask via OAI-PMH? Identify GetRecord ListIdentifiers ListMetadataFormats ListRecords ListSets

Identify Who are you? What kind of stuff do you contain? What is the copyright of your data and your metadata? A collection-level description

GetRecord Give me the metadata of a single record!

ListRecords Give me the metadata of all your records! May be limited by the date a record was last modified May be limited to a subset of the archive (e.g. only physics related records, but only if supported by archive)

ListIdentifiers Give me a list of all your records! May be limited by date record was last modified May be limited to a subset of the archive (e.g. only physics related records, but only if supported by archive)

ListMetadataFormats What metadata formats can you supply? All archives must supply Dublin Core but may supply other metadata formats too.

ListSets What subsets of your records may I ask for? Some archives define subsets, by subject, by rights etc. e.g. Physics related records, or public domain items or peer-reviewed items.

So how does a service query an archive? The first time it asks for ALL records. Then, every so often (day, week…) it asks for everything thats changed since it last asked.

CogPrints (GNU EPrints) 1600 Records (GNU EPrints) 264 Records arXiv (custom software) 230,000 Records MIT (D-Space Software) 769 Records Harvester #1 (Psychology Service) 500 Cogprints 169 D-Space Harvester #2 (Physics Aggregator) 150,000 arXiv 162 D-Space Harvester #3 (General Service) 230,000 arXiv 769 D-Space 264 OrgPrints 1600 CogPrints 150,162 Improved records from physics aggregator

Archive Service A 1403 records Harvester Give me everything! 1403 records OK! (1403 records) Day 1

Archive Service A 1501 records Harvester Archive Service B 123 records Give me everything in set physics 1403 records OK! (15 records) Day 2 15 records Give me all records which were added or changed since yesterday OK! (102 new records, 4 deleted records, 23 changed records) 1501 records

Archive Service A 1490 records Harvester Archive Service B 123 records Give me everything in set physics which were added or changed since yesterday records OK! (0 new records, 1 record changed) Day 3 15 records Give me all records which were added or changed since yesterday OK! (25 new records, 36 deleted records, 3 changed records) 1490 records

What are these records? Dublin Core Title Creator Date Description Identifier (URL) … Very simple, but more useful than plain text.

Dublin Core in OAI Do I have to use Dublin Core? Its not very good, is it? You must provide Dublin Core data via OAI, so that all harvesters can use your data. You may also provide any other metadata formats you want to (MARC, AMF, one you- made-up etc.)

What a user sees… Our example user is searching for an item about badgers that they heard about that was written by someone called Monkhouse. They tried google but only found articles which mentioned the item they were looking for or fan sites about Bob Monkhouse the TV presenter.