Digital Repositories – Linked Open Data – the possible Role of D4Science Workshop, 16-17 December 2010, FAO use cases A tool to create Linked Data providers.

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Workshop, 16-17 December 2010, FAO

use cases

A tool to create Linked Dataproviders and consumers

Valeria PesceGlobal Forum on Agricultural Research (GFAR)

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

The AgriDrupal community• The AgriDrupal community is made up of people who work in the

community of agricultural information management specialists and have been experimenting with IM solutions with the Drupal CMS

•The community interacts using the AIMS community platform: http://aims.fao.org/community/home

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

AgriDrupal solutions and “demo tool”

• One or more “reference” installations of AgriDrupal including all or only selected functionalities can be made available – for testing purposes– for adoption by Institutions looking for a full-fledged tool for

integrated information management and dissemination

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Drupal as a LOD provider1. Content types, metadata and RDF

• In-built capacity to treat any kind of user-defined content type: from simple web pages to events, contacts, bibliographical records or any custom content types

• For each content type, a suitable metadata set can be designed with no programming

• Each content type can be mapped to an RDF class from any vocabulary; each field in the metadata set can be mapped to an RDF property from any vocabulary

• Content types = classes. Nodes = entities, instantiation of content types / classes. Nodes’ URLs are the entities’ URIs.

- All structured contents - Custom RDF vocabularies- URIs

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Mapping metadata to RDF vocabularies

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Using recommended vocabularies

Analyze this decisional workflow, apply the scenario you prefer

mapping of fields/elements to RDF properties

custom content model

Example: recommendations for AGRIS (from Imma’s slides)

Implement the recommendations in Drupal

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Drupal as LOD provider

2. Views and SPARQL engine

• Drupal has the in-built capacity to provide any number and type of views over the stored contents: from simple lists of news to tables with selected columns to calendars to feeds and XML/RDF or Json exports

• Drupal can make available a SPARQL engine to query the whole triple store

- RDF outputs available in different notations (e.g. RDF/XML for Agris)

- RDF store exposed through a SPARQL engine

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Example of view: RDF feed

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Drupal as a SPARQL endpointQuery run on a Drupal website from a Virtuoso test environment at http://demo.openlinksw.com/sparql_demo/

SPARQL endpoint

RDF triples

Drupal website

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Drupal as LOD provider

• External authority control:

– web services and SPARQL queries can be used to access external authority control sources;

– URIs can be stored in the system together with useful literal values in different fields;

- Links to external resources with URIs already in the system

- RDF outputs include external URIs

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Authority control: authors

Search and referenceCreate and reference

Drupal data entryInternal authority control

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Authority control: journals

Now: internal authority records

Next step: shared authority records

Workbenchweb services

Drupaldata entry

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Authority control: subject: Agrovoc

>> click <<

Drupal data entry Agrovoc web services client popup

Drupal search interface

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Drupal as LOD consumer

2. Feed aggregation and SPARQL views

• Drupal can aggregate RDF feeds and store their items even with full custom metadata

• Drupal can run SPARQL queries on remote endpoints and display the results

- Aggregated RDF records can be either stored or displayed on the fly- Dynamic SPARQL queries can be run on any SPARQL engine

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Drupal as a SPARQL client

Drupal Views interface: SPARQL View pluginRemote SPARQL

engine

Drupal block

“Digital Repositories – Linked Open Data – the possible Role of D4Science”

Workshop, 16-17 December 2010, FAO

use cases

Thank you