STI OC Result

1. www.sti-innsbruck.at© Copyright 2008 STI INNSBRUCK www.sti-innsbruck.at
RDF Best Practice
Best Practice Recipes for Publishing RDF Vocabularies
W3C Working Group Note 28. August 2008
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http://www.w3.org/TR/2008/NOTE-swbp-vocab-pub-20080828/

2. www.sti-innsbruck.at
Publishing RDF Ontologies
• Content Negotiation
• Dereferencable concept URIs
• HTTP 303 Redirects
• Concept Name separated from the URI via slash (/) or hash
(#)

3. www.sti-innsbruck.at
Content Negotiation
• Client specifies preferred format (in HTTP Header), e.g.
– Accept: application/rdf+xml
– Accept: application/xhtml+xml, text/html
• Fallback type must be specified

4. www.sti-innsbruck.at
Dereferencable Ontology URIs
• Example:
− Access e-Freight Ontology:
http://efreight.sti2.at/ontology/crs.owl

5. www.sti-innsbruck.at
Dereferencable Concept URI
• Example:
− GET the class Shipment:
http://efreight.sti2.at/ontology/crs.owl#Shipment
− Redirect to vocabulary URI:
http://efreight.sti2.at/ontology/crs.owl

6. www.sti-innsbruck.at
Server-Side Configuration
• .htaccess for ‘hash namespaces‘, e.g. http://efreight.sti2.at/ontology/crs.owl#Shipment
• AddType application/rdf+xml .owl
• RewriteEngine On
• RewriteBase /crs
• RewriteRule ^crs$ crs.owl
• .htaccess for ‘slash namespaces’, e.g. http://efreight.sti2.at/ontology/crs/Shipment
• AddType application/rdf+xml .owl
• RewriteEngine On
• RewriteBase /crs
• RewriteRule ^crs/.+ crs/ [R=303]
• RewriteRule ^crs/$ crs.owl

7. www.sti-innsbruck.at
Redirect to SPARQL Query
• Server-side configuration (.htaccess file)
RewriteCond %{HTTP_ACCEPT} text/html
RewriteRule ^crs/(.+) http://dbpedia.org/$1 [R=303]
RewriteCond %{HTTP_ACCEPT} application/rdf+xml
RewriteRule ^crs/(.+) http://dbpedia.org/sparql?query=DESCRIBE+<http://dbpedia.org/$1> [R=303]

8. www.sti-innsbruck.at
Summary
• Dereferencable URIs for all concept in the ontology
• 303 Redirect to the Ontology if a concept is accessed
• Possible to separate the namespace with a slash (/) or a hash (#)
• Content Negotiation with fallback type
• Redirecting to SPARQL Query