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Open Archives Initiative Object Reuse and Exchange


In the physical world we create, use, and refer to aggregations of things all the time. We collect pictures in a photo album, read journals that are collections of articles, and burn CDs of our favorite songs. In this physical world these aggregations are frequently tangible – we can hold the photo album, journal, and CD. But, we also aggregate abstract entities – for example classification schemes aggregate abstract subjects into broader abstract groups. This practice of aggregating extends to the Web. We accumulate URL’s in bookmarks or favorites lists in our browser, collect photos into sets in popular sites like Flickr, browse over multiple page documents that are linked together through “prev” and “next” tags, and talk about Web sites as if they had some real existence beyond the set of pages of which they consist. Despite our frequent use of these aggregations, their existence on the Web is quite ephemeral. One reason for this is that there is no standard way to identify an aggregation. We often use the URI of one page of an aggregation to identify the whole aggregation. For example, we use the URI of the first page of a multi-page Web document to identify the whole document, or we use the URI of the HTML page that provides access to a Flickr set to identify the entire set of images. But those URIs really just identify those specific pages, and not the union of pages that makes up the whole document, or the union of all images in a Flickr set, respectively. In essence, the problem is that there is no standard way to describe the constituents or boundary of an aggregation, and this is what OAI-ORE aims to provide.

Examples

Add another example.

A National Digital Newspaper Project Batch

An abbreviated example of a NDNP batch of newspaper issue data. more…

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix ndnp: <http://chroniclingamerica.loc.gov/terms#> .
@prefix ore: <http://www.openarchives.org/ore/terms/> .

<http://chroniclingamerica.loc.gov/batches/batch_dlc_harry_ver01.rdf>
    dcterms:created "2010-03-30T05:30:56-04:00"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
    dcterms:creator <http://chroniclingamerica.loc.gov/awardees/dlc#awardee> ;
    dcterms:modified "2010-03-30T05:30:56-04:00"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
    ore:describes <http://chroniclingamerica.loc.gov/batches/batch_dlc_harry_ver01#batch> ;
    a ore:ResourceMap .

<http://chroniclingamerica.loc.gov/batches/batch_dlc_harry_ver01#batch>
    ndnp:bag <http://chroniclingamerica.loc.gov/data/dlc/batch_dlc_harry_ver01/> ;
    dcterms:created "2009-12-09T14:07:21-04:00"^^<http://www.w3.org/2001/XMLSchema#dateTime> ;
    dcterms:creator <http://chroniclingamerica.loc.gov/awardees/dlc#awardee> ;
    dcterms:title "batch_dlc_harry_ver01" ;
    ore:aggregates <http://chroniclingamerica.loc.gov/lccn/sn2008058169/1890-01-27/ed-1#issue>, <http://chroniclingamerica.loc.gov/lccn/sn2008058169/1890-01-28/ed-1#issue>, <http://chroniclingamerica.loc.gov/lccn/sn2008058169/1890-01-29/ed-1#issue> ;
    ore:isDescribedBy <http://chroniclingamerica.loc.gov/batches/batch_dlc_harry_ver01.rdf> ;
    a ndnp:Batch .