- From: Michael Schneider <m_schnei@gmx.de>
- Date: 2007年2月22日 17:46:30 +0100
- To: richard@cyganiak.de
- CC: semantic-web@w3.org
- Message-ID: <45DDC8E6.2020708@gmx.de>
Hi, Richard! Richard Cyganiak wrote on 2007年2月22日: > I'm not so sure about > comparisons between data models that are less similar. For example, > SQL schemas may contain integrity constraints that use arbitrary SQL > expressions, like calculations. These constraints cannot be expressed > in OWL. Isn't SQL semantically richer then? Oh! I have to admit that I did not think that far. By "relational schemes" I just meant collections of table definitions by their attributes, together with some basic inter-table relationships like foreignkeys. Now, with such general integrity constraints in mind, the whole discussion might perhaps get quite another direction. Hm... Cheers, Michael
Received on Thursday, 22 February 2007 16:46:39 UTC