Ivan Herman wrote:
Just for the records...
Ivan Herman wrote:
Mark,
[snip]
Also, are we sure that
<s> rdfs:label "alt".
is the best representation for this? I am afraid of finding ourselves in
some endless discussion with, say, WAI people on the meaning of the
'alt' attribute; one could also say that
<s> rdfs:seeAlso "alt".
I wouldn't encourage this use.
B.t.w., I realized yesterday evening (under the shower, the best place
for these things:-) that this is wrong. The range of rdfs:seeAlso is
defined to be rdf:Resource by the RDF Semantics, ie, it should not be
used with a Literal as an object.
I guess you don't have a waterproof laptop? :)
Couple of errors there. In http://www.w3.org/2000/01/rdf-schema#
<rdf:Property rdf:about="http://www.w3.org/2000/01/rdf-schema#seeAlso";>
<rdfs:isDefinedBy rdf:resource="http://www.w3.org/2000/01/rdf-schema#"/>
<rdfs:label>seeAlso</rdfs:label>
<rdfs:comment>Further information about the subject
resource.</rdfs:comment>
<rdfs:range
rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
<rdfs:domain
rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
</rdf:Property>
and
<rdfs:Class rdf:about="http://www.w3.org/2000/01/rdf-schema#Literal";>
<rdfs:isDefinedBy rdf:resource="http://www.w3.org/2000/01/rdf-schema#"/>
<rdfs:label>Literal</rdfs:label>
<rdfs:comment>The class of literal values, eg. textual strings and
integers.</rdfs:comment>
<rdfs:subClassOf
rdf:resource="http://www.w3.org/2000/01/rdf-schema#Resource"/>
</rdfs:Class>
ie. it's rdfs:Resource not rdf:Resource, and that class has a subclass
rdfs:Literal, which means that there can be some resources that are
literals (and that all literals are resources). This is counter to
various uses of the word "resource" from 1999-era RDF. Since RDFCore,
"resource" means, more or less, "thing". There is no named class for
non-literal resources (although this could be expressed in OWL).
That said, the general assumption with seeAlso is that it relates
(broadly) information resources to each other. We just never had such a
class defined. Using it to point to a string seems wrong. Just because
the schema doesn't formally outlaw it, doesn't make it a good usage.
http://esw.w3.org/topic/UsingSeeAlso is a good place for keeping notes
on community expectations around seeAlso usage.
As an aside from RDFa, ... one usage I've not seen yet, but which might
be interesting, is to have the cited graph packed into a data: URI.
But there is also rdfs:comment, for
example, that could be used instead of rdfs:label, so the original
argument holds...
Ivan
