One of the primary goals of ViewChange.org has been to bring the concepts of the Semantic Web to video. When we began conceptualizing the ViewChange platform, the use of Linked Data and participation in the Linking Open Data (LOD) cloud were core requirements, as we wanted to provide both semantic meaning and the potential for deep exploration. Being a video-centric site, this presented a unique set of challenges.
The Web of text
Metadata & accessibility
ViewChange.org exposes semantic metadata in a number of ways. RDFa markup is used throughout the site to identify resources and the relationships between them. Popular ontologies, such as Dublin Core, FOAF, and Facebook’s Open Graph protocol, are used to provide standard, interoperable metadata, and enhanced accessibility. Topic and video pages also provide RDF/XML representations, for efficient machine processing.
Linked Data concepts
ViewChange addresses the the four concepts of Linked Data, outlined by Tim Berners-Lee, as follows:
1. Use URIs as names for things
All topic and video resources on ViewChange.org have unique permalink URIs, which serve as strong identifiers.
2. Use HTTP URIs so that people can look up those names.
Topic and video pages are accessible via HTTP, naturally.
3. When someone looks up a URI, provide useful information, using the standards (RDF*, SPARQL)
When a video or topic URI is dereferenced, structured data is returned using either XHTML+RDFa or RDF/XML.
4. Include links to other URIs. so that they can discover more things.
ViewChange.org topics are semantically linked to entities in databases such as Freebase and DBpedia (using owl:sameAs), while videos expose links to a wide range of related content.
Much like the Semantic Web itself, the Linked Data implementation in ViewChange.org is a work in progress. We are very interested in feedback from the community, so please let us know if there’s something we could be doing better.