From: Frank van Harmelen (Frank.van.Harmelen@cs.vu.nl)
Date: 12/25/00
Dear joint-everybody,
While working on the DAML+OIL annotated example (aka the "walkthru"), I noticed the following point. I would be interested in your opinion:
One place where DAML+OIL annotations might live is inside .html files. We would want browsers to be undisturbed by the DAML+OIL annotations (ie, display nothing of these annotations). I believe this is called "avoiding exposed content" in the RDF M&S spec. I understand that RDF was explicitly designed to make this possible (see section 7.7 of http://www.w3.org/TR/REC-rdf-syntax/).
Our current DAML+OIL syntax does very well in this respect. Besides some semantics-less tags like <versionInfo> and <comment>, all of DAML+OIL avoids exposed contents, WITH THE SINGLE EXCEPTION OF CARDINALITY CONSTRAINTS! An expression like
<restrictedBy>
<Restriction>
<onProperty rdf:resource="#father"/>
<cardinality>1</cardinality>
</Restriction>
</restrictedBy>
will display as "1" in a browser, which is unfortunate. Can this be avoided?
Frank.
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