From: Dan Connolly (connolly@w3.org)
Date: 09/04/01
Dan Connolly wrote:
[...]
> My tool of choice barfed... so I submitted the attached
> ontology to our new RDF validation service
> http://www.w3.org/RDF/Validator/
> and I got:
>
> Error: {E201} Syntax error when processing rdf:parseType. Cannot have
> rdf:parseType in this context.[Line = 41, Column = 58]
> Error: {E201} Syntax error when processing rdf:parseType. Cannot have
> rdf:parseType in this context.[Line = 118, Column = 58]
> Error: {E201} Syntax error when processing rdf:parseType. Cannot have
> rdf:parseType in this context.[Line = 216, Column = 58]
> Error: {E201} Syntax error when processing rdf:parseType. Cannot have
> rdf:parseType in this context.[Line = 354, Column = 58]
>
> I'm in the process of fixing these errors... I'll share
> the results when I have them.
The probem was the use of two RDF property elements
inside each other without an interleaved class... the
nesting of elements in RDF is "striped"; it
alternates between class and property;
this wasn't properly striped...
<daml:Class rdf:ID="Query">
<rdfs:subClassOf>
<daml:intersectionOf rdf:parseType="daml:collection">
<daml:Restriction>
<daml:onProperty rdf:resource="#queryPremise"/>
<daml:maxCardinality> 1 </daml:maxCardinality>
</daml:Restriction>
the child of the subClassOf element has to be a class
(so called "typednode" or "object" in the RDF grammar);
the degenerate/placeholder class tag is rdf:Description;
so this works:
<daml:Class rdf:ID="Query">
<rdfs:subClassOf>
<rdf:Description> <!-- added this -->
<daml:intersectionOf rdf:parseType="daml:collection">
<daml:Restriction>
<daml:onProperty rdf:resource="#queryPremise"/>
<daml:maxCardinality> 1 </daml:maxCardinality>
</daml:Restriction>
Full diffs are attached.
Meanwhile...
> We chuckled on the phone about what an obscure mechanism it is
> for communication in the group...
> but I hope each of us has at his/her disposal some tools
> that render DAML+OIL intelligible to us in some familiar
> notation/interface.
>
> My tool of choice...
is cwm/notation3; I find it more readable...
:PropertyTerm a daml:Class;
daml:disjointUnionOf (
:Variable
:PropertyConstant ) .
:QualifiedName a daml:Class;
rdfs:subClassOf [
daml:intersectionOf (
[
daml:onProperty :nsName;
daml:cardinality " 1 " ]
[
daml:onProperty :localName;
daml:cardinality " 1 " ] ) ] .
In case others do too, here's the whole thing in RDF/n3:
http://www.w3.org/2000/10/swap/test/dpoq22Aug/query-answer.n3
TimBL wrote a pretty reasonable intro to RDF/n3
http://www.w3.org/2000/10/swap/Primer
and I recently re-implemented the parser using
a parser toolkit:
http://www.w3.org/2000/10/swap/rdfn3.g
I generated a hypertext version of the grammar while I was at it:
http://www.w3.org/2000/10/swap/rdfn3-gram.html
We haven't done much release engineering around cwm, so I
won't recommend folks try to install it themselves, but you
can use it to convert between RDF/xml and RDF/n3 (and back)
via a web interface:
http://swag.webns.net/n3tordf
For the adventurous, source is available
http://www.w3.org/2000/10/swap/
http://dev.w3.org/cvsweb/2000/10/swap/
--
Dan Connolly, W3C http://www.w3.org/People/Connolly/
Index: query-answer.daml
===================================================================
RCS file: /w3ccvs/WWW/2000/10/swap/test/dpoq22Aug/query-answer.daml,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -r1.1 -r1.2
--- query-answer.daml 2001/09/04 20:57:23 1.1
+++ query-answer.daml 2001/09/04 21:44:45 1.2
@@ -6,7 +6,7 @@
>
<daml:Ontology rdf:about="">
- <daml:versionInfo>$Id: query-answer.daml,v 1.1 2001/09/04 20:57:23 connolly Exp $</daml:versionInfo>
+ <daml:versionInfo>$Id: query-answer.daml,v 1.2 2001/09/04 21:44:45 connolly Exp $</daml:versionInfo>
<rdfs:comment> An ontology of basic query answering terms </rdfs:comment>
<daml:imports rdf:resource="http://www.w3.org/1999/02/22-rdf-syntax-ns"/>
<daml:imports rdf:resource="http://www.w3.org/2000/01/rdf-schema"/>
@@ -38,6 +38,7 @@
</rdfs:comment>
<rdfs:subClassOf>
+ <rdf:Description>
<daml:intersectionOf rdf:parseType="daml:collection">
<daml:Restriction>
<daml:onProperty rdf:resource="#queryPremise"/>
@@ -49,6 +50,7 @@
<daml:cardinality> 1 </daml:cardinality>
</daml:Restriction>
</daml:intersectionOf>
+ </rdf:Description>
</rdfs:subClassOf>
</daml:Class>
@@ -115,6 +117,7 @@
<daml:Class rdf:ID="VariableBinding">
<rdfs:subClassOf>
+ <rdf:Description>
<daml:intersectionOf rdf:parseType="daml:collection">
<daml:Restriction>
<daml:onProperty rdf:resource="#var"/>
@@ -136,6 +139,7 @@
<daml:cardinality> 1 </daml:cardinality>
</daml:Restriction>
</daml:intersectionOf>
+ </rdf:Description>
</rdfs:subClassOf>
</daml:Class>
@@ -213,6 +217,7 @@
<daml:Class rdf:ID="Triple">
<rdfs:subClassOf>
+ <rdf:Description>
<daml:intersectionOf rdf:parseType="daml:collection">
<daml:Restriction>
<daml:onProperty rdf:resource="#predicate"/>
@@ -229,6 +234,7 @@
<daml:cardinality> 1 </daml:cardinality>
</daml:Restriction>
</daml:intersectionOf>
+ </rdf:Description>
</rdfs:subClassOf>
</daml:Class>
@@ -351,6 +357,7 @@
<daml:Class rdf:ID="QualifiedName">
<rdfs:subClassOf>
+ <rdf:Description>
<daml:intersectionOf rdf:parseType="daml:collection">
<daml:Restriction>
<daml:onProperty rdf:resource="#nsName"/>
@@ -362,6 +369,7 @@
<daml:cardinality> 1 </daml:cardinality>
</daml:Restriction>
</daml:intersectionOf>
+ </rdf:Description>
</rdfs:subClassOf>
</daml:Class>
This archive was generated by hypermail 2.1.4 : 04/02/02 EST