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@micky, the official Jena mailing list has moved to Apache. See here:
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Paolo
Dave Reynolds wrote:
On Thu, 2011-11-17 at 03:10 +0000, micky wrote:
Hi all, I am wandering is pure numbers (e.g. 123) permitted as
individual names?
Judging by your code example I think you mean that you want a hash URI
where the hash part is a digit string.
Short answer: yes, that's legal though may trip you up
Longer answer:
A digit string is a legal fragment identifier in a URI and thus an IRI.
The RDF model itself places no additional syntactic restrictions which
stop you using it. However, not all legal RDF models can be serialized
in all RDF syntaxes.
In Turtle [1] then you are allowed pure digit strings as the LOCAL part
of a prefixed name (which is defined by reference to SPARQL [2]). Even
if that weren't the case you could always spell out the full "<...>" URI
each time. So you can serialize it in Turtle (and indeed N-Triples) just
fine.
In RDF/XML you couldn't use such a URI for a class or property name
because it is not possible to construct a legal QName which when
concatenated would reconstruct that URI. You can use it for an
individual name because then the URI need only be given via rdf:about or
rdf:resource attributes. However, 123 isn't a legal XML ID and so you
can't use rdf:ID - that isn't a problem so long as you are aware of it.
The Jena getNamespace function is purely there to support generation of
QName pairs that can be used in XML serializations. Which is why you get
the (correct) results you do from the code sample. If you want to use
identifiers of this shape and want to split your URIs in a "natural" way
then write your own namespace function to just split at the last '#' or
'/'.
Dave
[1] http://www.w3.org/2010/01/Turtle/
[2] http://www.w3.org/TR/rdf-sparql-query/#rPN_LOCAL
Since Jena is not acting consistently on this issue (see code below).
Sorry if this question is too lame, but I am not able to find a
definite answer from W3C OWL specifications or by searching the web.
Thanks!
-----code-----
public class JenaApi {
public static void main(String args[]) {
String SOURCE = "http://www.eswc2006.org/technologies/ontology";;
String NS = SOURCE + "#";
OntModel base =
ModelFactory.createOntologyModel( OntModelSpec.OWL_MEM );
base.read( SOURCE, "RDF/XML" );
OntClass paper = base.getOntClass( NS + "Paper" );
Individual p1 = base.createIndividual( NS + "111", paper );
System.out.println("name space: "+p1.getNameSpace());
System.out.println("local name: "+p1.getLocalName());
Individual p2 = base.createIndividual( NS + "paper1", paper );
System.out.println("name space: "+p2.getNameSpace());
System.out.println("local name: "+p2.getLocalName());
}
}
-----output-----
name space: http://www.eswc2006.org/technologies/ontology#111
local name:
name space: http://www.eswc2006.org/technologies/ontology#
local name: paper1
-----end-----
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