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[protege-owl] How to detect undefined references in rdf:resource

Bunsz bunsz at
Mon Jan 25 05:39:11 PST 2010

Thank you again Thomas,

I am able to reproduce this, and now I really would like this 
"protege:ExternalResource" class to be used within SQWRL rules in order 
to collect all individuals of this type. Unfortunately this rule 
"protege:ExternalResource(?e) ? sqwrl:select(?e)" seems to be 
syntactically wrong ("Error: Invalid atom name 
'protege:ExternalResource'.) For SQWRL this class doesn't seem to be 
visible. Do you know why? And can this state be changed somehow?

Regards, Michael

Am 22.01.2010 22:17, schrieb Thomas Russ:
> On Jan 20, 2010, at 2:56 PM, Buns wrote:
>> Thank you, Thomas,
>> but how do I make UntypedResource a visible Class? Do I have to 
>> define it explicitly?
> Actually, it seems to appear in the Protege 3.4.2 automatically 
> whenever it is needed.
> The real name is "protege:ExternalResource".
> Attached is a screen shot from my editor showing this for a simple 
> test ontology defined as:
> <owl:ObjectProperty rdf:ID="P"/>
> <owl:Thing rdf:ID="i">
> <P rdf:resource="#unknown"/>
> </owl:Thing>
> where there is one otherwise undefined RDF resource named "unknown".
>> The background is, I generate an ontology out of an XML-file using 
>> XSLT in order to use it for verification purposes and for detecting 
>> kind of inconsistencies. In this context ... can this UntypedResource 
>> class be used as a dump, where all references to undefined resources 
>> can be collected?
> Well, I would think that when you load the OWL file into Protege any 
> such external resources would be collected under this class.
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