Freire model api

Data Model and API

Nuno Freire

RLUK Hack DayLondon, 14th of May 2014

Outline

The data model• The entities, properties and URIs

The RLUK dataset• Which data elements are available • Linked external datasets

The OpenSearch API• Searching within the RLUK dataset• RLUK dataset URIs and the API output

The Data Model

The Data Model RDA Element Vocabularies

• The most extensivelly used vocabularies in the RLUK dataset

• Used entensivelly in the properties of the Bibliographic Resources

FRBRer model• Used for context

• Not used for Item, Manifestation, Expression, Work

• The RLUK LOD data is derived from non-FRBR MARC data

Europeana Data Model• Used for Web Resources

OWL 2 Web Ontology Language• Used for linking to external datasets

• For linking duplicate Bibliographic Resources within the RLUK dataset

Dublin Core Terms• Used where more general semantics could/should be applied

WGS84 Geo Positioning OAI ORE Terms

• Used for establishing the relations between Bibliographic and Web Resources

The Data Model

Properties• A large number of properties are available

describing the Bibliographic Resources and their contextual information

• A complete list of the properties is available in the Data Model documentation

• The frequency of availability of the properties within the RLUK dataset, is available in the Statistics documentation

Classes and URIs

Bibliographic Resources• http://data.theeuropeanlibrary.org/BibliograpicResource/...

Web Resources• The URIs are relative to the Bibliographic Resource• http://data.theeuropeanlibrary.org/BibliograpicResource/...#webresource....

Aggregations• The URIs are relative to the Bibliographic Resource• http://data.theeuropeanlibrary.org/BibliograpicResource/...#webresource....

Other entities • All other entities are encoded as RDF blank nodes

The LOD platform at The European Library serves all entites from the URI of the Bibliographic Resources

• Web Resources and Aggregations have URIs that include fragments “#...” • Other entities as RDF blank nodes

Available data in the RLUK dataset

Usage of classes


Usage of properties


Usage of data types

External LOD Datasets Linked To

Links to external datasets linked are available for the following:• VIAF Virtual Union Authority File• Geonames • Library of Congress Subject Headings• Library of Congress Children’s Subject Headings • Library of Congress Classification• data.bnf.fr• Gemeinsame Normdatei• Dewey Decimal Classification• ISO639-2 Languages• MARC Countries

Availability of links

External LOD Datasets Linked To

Searching within the RLUK dataset

The European Library provides an OpenSearch API for its complete dataset• Queries may be narrowed to the RLUK dataset

To use the API, registration in The European Library portal is required• An API key is provided to each registered

user

The API outputs are in XML and JSON• Each search result includes the LOD URI,

which can be used to access the RDF

Overview of the OpenSearch API

In order to search within the RLUK dataset a parameter should be specified:• provider-id=P02023

Overview of the OpenSearch API

In XML responses, the LOD URI is present in the first dc:identifier element

In JSON responses, a URI field contain the LOD URI

LOD Content Negotiation

The responses to URIs are done according to LOD Content Negotiation, as follows: • Programmatic access to the URIs, or through data browsers,

should specify the RDF representation desired by specifying an HTTP header “Accept”. The following RDF representations (mime types) are available:

• text/turtle• application/rdf+xml• application/rdf+json• text/n3• text/rdf+n3• application/x-binary-rdf

LOD Content Negotiation

LOD Content Negotiation is supported in data.theeuropeanlibrary.org.

Any request to the URIs made with a web browser will be redirected to the corresponding HTML page at the portal.

The web browser requests for the URIs are sent with the HTTP header Accept:text/html or Accept:application/xhtml+xml, therefore they are redirected to the corresponding HTML page at the portal.

For obtaining the RDF data for a URI with a web browser, you may append the HTTP parameter “format=rdf” to the URI.http://data.theeuropeanlibrary.org/BibliographicResource/2000068736918?format=rdf

Thank you for your attention

Contact:[email protected]

Freire model api

Presentations & Public Speaking

Transcript of Freire model api