Talk:Semantic MediaWiki/Background: Ontologies and the Semantic Web
Ontologies represent Implied Properties[edit]
The Berlin example has the relations is city in::is capital of::Germany. But "is capital of" implies (in RDF-speak, rdfs:subPropertyOf) "is city in", so with full RDF parsing, "is city in" is unnecessary. Similarly, the Germany example has the relation has capital::Berlin. But this is redundant information, "x is capital of y" implies "y has capital x". I think you can represent this using the OWL property owl:inverseOf. In the Semantic MediaWiki plan the actual statements of these two relations live in different pages.
--skierpage 06:58, 3 October 2005 (UTC)
- Answered this on the Berlin talkpage. --denny 16:32, 5 October 2005 (UTC)
I am confused...[edit]
In the text I read;
- However, OWL is downwards compatible; OWL ontologies can be processed with tools that were conceived for RDF or even for XML as well. The converse is generally not true.
What does this mean exactly? Its the sentence that reads "The converse is generally not true" that I don't understand.