“While extensibility of a given XML DTD or schema must be designed into it from the start, RDFS and OWL schemas allow a lot more flexibility and therefore more possibilities to build on the work of others.”
“… it’s much easier to combine multiple RDFS/OWL schemas for a single application than it is to combine multiple XML schemas/DTDs.”
http://www.snee.com/bobdc.blog/2009/04/semantic-web-technology-and-hu.html
Defining N-ary Relations on the Semantic Web
http://www.w3.org/TR/swbp-n-aryRelations/
CouchDB – Schema-Free: Unlike SQL databases which are designed to store and report on highly structured, interrelated data, CouchDB is designed to store and report on large amounts of >>semi-structured, document oriented data<<. http://couchdb.apache.org/docs/intro.html
The data model (not “format”) is called RDF (vs relational, not vs XML) http://artofsystems.blogspot.com/2009/06/semantic-web-or-generic-at-war-with.html
Semi-Structured Data? http://www.dcs.bbk.ac.uk/~ptw/teaching/ssd/slide3.html
“RDF as a flexible semi-structured graph model has value even if you aren’t using it on the web.” (source)
- Leigh Dodds
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