OAI-ORE

Object Reuse and Exchange

Brought to you by the Open Archives Initiative

Haven't I heard of OAI before?

Sure, you might know OAI-PMH

Protocol for Metadata Harvesting

http://digital.library.unt.edu/oai/

http://texashistory.unt.edu/oai/

But we are talking about OAI-ORE

(OAI-ORE) defines standards for the description and exchange of aggregations of Web

resources.

Basic use case

We have a digital object

Which has many ways of interacting with it.

You could grab a citation

Or get the metadata

Lets say in Dublin Core format

This object has one manifestation

With 19 file sets

In this object a file set is a page

Which has multiple sizes to view

Here is a big one

And here is a small one

And of course pages of text have OCR

So about those aggregations

It is hard for a machine to know what constitutes a digital object on the Web

Our idea of a digital objectWhich are comprised of manifestations

Which are comprised of file setsWhich are comprised of files

Can't really be guessed by machines

Even if it could guess our structure

What about everyone else's?

OAI-ORE was developed to solve this problem

We have many aggregations in digital libraries

We have partners

Aggregation

We have collections

Aggregation

Partners/Collections have objects

Aggregation

Objects have object level files(thumbnail, small image, citation, metadata)

Aggregation

Our objects have manifestationsMaybe more than one

(image view, pdf file, html files, gis zip)

Aggregation

Those manifestations have file sets(think pages for book objects)

Aggregation

File sets have files(ocr, thumbnail, square, small, medium, xl, tiles)

Aggregation

Aggregations exist outside of the digital library

List of tracks in a playlist

Aggregation

Flickr Set

Aggregation

All of your bookmarks

Aggregation

We get it, there are aggregations

Some aggregations are abstract

Some aggregations are tangible

An aggregation is given a URI just like anything else on the Web

Maybe

http://digital.library.unt.edu/ark:/67531/metadc1228/#object

In OAI-ORE aggregations are described using a resource map

Which is a machine readable document with its own URI

Maybe

http://digital.library.unt.edu/ark:/67531/metadc1228.rdf

So

http://digital.library.unt.edu/ark:/67531/metadc1228.rdf

Describes

http://digital.library.unt.edu/ark:/67531/metadc1228/#object

Which is the aggregation for

http://digital.library.unt.edu/ark:/67531/metadc1228/

http://digital.library.unt.edu/ark:/67531/metadc1228.rdf

Points to all the objects manifestation aggregations

http://digital.library.unt.edu/ark:/67531/metadc1228/m1/#manifestationhttp://digital.library.unt.edu/ark:/67531/metadc1228/m2/#manifestationhttp://digital.library.unt.edu/ark:/67531/metadc1228/m3/#manifestation

Each has a resource map

http://digital.library.unt.edu/ark:/67531/metadc1228/m1.rdfhttp://digital.library.unt.edu/ark:/67531/metadc1228/m2.rdfhttp://digital.library.unt.edu/ark:/67531/metadc1228/m3.rdf

http://digital.library.unt.edu/ark:/67531/metadc1228/m1.rdf

Points to all the manifestations file set aggregations

http://digital.library.unt.edu/ark:/67531/metadc1228/m1/1/#filesethttp://digital.library.unt.edu/ark:/67531/metadc1228/m1/2/#filesethttp://digital.library.unt.edu/ark:/67531/metadc1228/m1/3/#fileset

…

Each has a resource map

http://digital.library.unt.edu/ark:/67531/metadc1228/m1/1.rdfhttp://digital.library.unt.edu/ark:/67531/metadc1228/m1/2.rdfhttp://digital.library.unt.edu/ark:/67531/metadc1228/m1/3.rdf

…

http://digital.library.unt.edu/ark:/67531/metadc1228/m1/1.rdf

Points to all of the pieces of the file set

http://digital.library.unt.edu/ark:/67531/metadc1228/m1/1/ocr/http://digital.library.unt.edu/ark:/67531/metadc1228/m1/1/thumbnail/

http://digital.library.unt.edu/ark:/67531/metadc1228/m1/1/small/http://digital.library.unt.edu/ark:/67531/metadc1228/m1/1/sizes/http://digital.library.unt.edu/ark:/67531/metadc1228/m1/1/zoom/

Now an OAI-ORE crawler could harvest an entire object

This is useful for search engines

Digital preservation

Web Harvesting

Self archiving

Sounds great, but what was that rdf thing?

OAI-ORE is a specification built with the Web in mind

Relies on concepts and technologies like

HTTPContent Negotiation

Linked DataCool URLsRDF/XML

ATOM XMLRDFa

All of which could be their own TechTalks

And besides, that's why we have

Brandon, Kurt and Lauren

The takeaway

Questions?