|To:||"[ontolog-forum] " <ontolog-forum@xxxxxxxxxxxxxxxx>, "[ontolog-forum]" <ontolog-forum@xxxxxxxxxxxxxxxx>|
|From:||"Hudson, Michael J (IT)" <Mike.Hudson@xxxxxxx>|
|Date:||Tue, 20 Jan 2009 10:19:02 -0500|
I would only note that RDF is not by nature an XML language. Its been forced into that format and you generally see it in that format... but it's not an XML language and its not a hierarchical language like XML. N3 or Turtle formats are the more straight forward and most natural ways of expressing RDF statements.
As to the second statement, RDF does currently lack reification, and that would solve most problems people have with the subject-predicate-object notation. However, most statements including addition can be expressed in RDF, though it may take more than one statement, which is fine. RDF (or XML) is not meant to be easy for humans to read as straight RDF. Easy enough to understand and/or edit a document in its native format, if need be... but its meant to be processed and visualized in some manner. RDF is a graph/network format and thus usually easier to understand visually as a graph.
OWL, as RDF's ontology language, isn't as complete as other ontological languages. But its goal, like XML, was to be simple so as to get more people, specifically non-ontological experts into the mix. Before XML, only the SGML gurus knew how to parse through the SGML specs to come up with valid documents. XML doesn't have all the features of SGML, but has enough that it satisfies most people's needs. The same goes with RDF and OWL.
Knoodl, btw, is a wiki that expresses any new vocabulary or ontological concept as a wiki web page. You never see the RDF or OWL if you don't want to. However, if you need to formalize it as RDF/OWL, you can... and thus... you can write applications that systematically use whatever vocabulary or ontology you've created and colloborated on.
Michael J. Hudson
Northrop Grumman TASC
Computer Systems Architect V
From: ontolog-forum-bounces@xxxxxxxxxxxxxxxx on behalf of John F. Sowa
Sent: Tue 1/20/2009 9:57 AM
Subject: Re: [ontolog-forum] vocabulary tools/knoodl
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