I think Drupal 7 stands a chance of being a killer semantic app, it’s the next version of a CMS with a sizeable install base and when the release is final and everyone starts upgrading suddenly tons of sites will be automatically exposing RDF in the form of embedded RDFa without any intervention on the … Read more
Context Datatourisme is a platform that allows to publish (via the Producteur component) and to consume (via the Diffuseur component) POI-related open data. It seems you have linked to a particular application developed over Diffuseur with a help of GraphQL Voyager. The application illustrates capabilities of the GraphQL API exposed by Diffuseur. The API documentation … Read more
CSS is not recognized by any Microdata parser that I’m aware of. You’ll need to add a meta tag to specify the image like this: <div itemscope itemtype=”http://schema.org/Article”> <meta itemprop=”image” content=”bg.jpg”></meta> <div style=”background-image:url(‘bg.jpg’)”></div> </div>
Basic definitions RDF is a concept. RDF is also a NAME of a vocabulary. RDFS is a NAME of another vocabulary. “ontology” is just a SYNONYM of the term “vocabulary”. Explanations RDF is a concept RDF is a concept or a way of describing things. The concept of RDF is that you are describing / … Read more
The problem you are facing in the ‘wicket’ example is called entity disambiguation, not entity extraction/recognition (NER). NER can be useful but only when the categories are specific enough. Most NER systems doesn’t have enough granularity to distinguish between a sport and a software project (both types would fall outside the typically recognized types: person, … Read more
Gephi was already mentioned, but I’ll incode screenshots and a short description here. Gephi can not just visualize graphs but also supports analyzing, layouting and further importing and exporting. There is a Semantic Web Import Extension that allows you to directly query (via SPARQL) or import RDF data. https://wiki.gephi.org/index.php/SemanticWebImport (You can install it directly within … Read more
By far the best RDF linked open data visualization tool that I’ve come across is LodLive: http://en.lodlive.it/ It knows of numerous SPARQL endpoints, including DBpedia. I’ve previously implemented a web based RDF authoring tool that hooks into it: https://github.com/robstewart57/discover-me-semantically .
The viewpoint of the CTO of a company that extensively uses RDF Triplestores commercially: Schema flexibility – it’s possible to do the equivalent of a schema change to an RDF store live, and without any downtime, or redesign – it’s not a free lunch, you need to be careful with how your software works, but … Read more
The best explanation is by example. Try googling for all cars advertised on the web with engines smaller than 2.0 litres that run unleaded, and have an mp3 connection and can been seen in a showroom conveniently accessible by public transport from my house. Google just won’t be able to help you with that query, … Read more
Differences between Microdata and RDFa While there are many (technical, smaller) differences, here’s a selection of those I consider important (used my answer on Webmasters as a base). Specifications As W3C’s HTML WG found no volunteer to edit the Microdata specification, it is now merely a W3C Group Note (see history), which means that there … Read more