- From: Frederick Giasson <fred@fgiasson.com>
- Date: Mon, 26 Nov 2007 08:05:57 -0500
- To: Karl Dubost <karl@w3.org>
- Cc: Semantic web list <semantic-web@w3.org>
Hi Karl, > > Is there a way to check that your vocabulary is consistent. The > answer could be: > > Your document is RDF valid but contains > > * an unknown vocabulary: vocab, > * an element which is not part of dc vocabulary: foobar Don't know if such a tool currently exists; but it shouldn't be hard to create a prototype one. For an easier development, you would only have to index such documents within a triplestore, and then to query it in different ways to answer to these questions. First you would check for ontologies know by the system. Then you would check if each classes and properties used to describe the resource belongs to the ontology. Then, you could easily check if rdfs:domains and rdfs:range for each properties are used properly. You would only have to check in the ontology definition what are the ranges and domains for used properties, then to dereference each resources each ObjectProperty refers to. Then you check the type of related resources to know if it is valid. Otherwise, if the system doesn't know a vocab, then it can tries to dereference the definition of the ontology by dereferencing the namespace of the ontology. Once the system put its hands on the definition of the ontology, it does what I explained above. You could even push the experience further and develop some OWL reasonning based on possible OWL descriptions of the ontology (constraints, etc). Such a system would "validate" the description of a resource "at the best of its knowledge". This means: with the information it knows, and with the information it is able to find (the dereferencing part of the strategy). So this problem come down to two things: sending sparql queries againts a triple store, andd hoping that URIs and Namespaces are dereferencable to get more knowledge about ontologies and resources to help your system validating any given resource. Take care, Fred
Received on Monday, 26 November 2007 13:07:13 UTC