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[protege-owl] protege owl api :outofmemory exception

sujaram at barc.gov.in sujaram at barc.gov.in
Wed Oct 1 04:08:34 PDT 2008


Hi Luigi,

Thanks for the help. I checked with the OWL validator. It is giving messages
about swrl rules such as 
# Untyped Object Property: http://www.w3.org/2003/11/swrl#arguments
# Untyped Object Property: http://www.w3.org/2003/11/swrl#propertyPredicate
# Untyped Object Property: http://www.w3.org/2003/11/swrl#classPredicate
# Untyped Object Property: http://www.w3.org/2003/11/swrl#head
# Untyped Object Property: http://www.w3.org/2003/11/swrl#builtin
# Untyped Object Property: http://www.w3.org/2003/11/swrl#argument1
# Untyped Object Property: http://www.w3.org/1999/02/22-rdf-syntax-ns#rest
# Untyped Object Property: http://www.w3.org/1999/02/22-rdf-syntax-ns#first
# Untyped Object Property: http://www.w3.org/2003/11/swrl#argument2
# Untyped Object Property: http://www.w3.org/2003/11/swrl#body

Also, there are messages like 

# Bad list first/rest subject: http://www.barc.gov.in/ISMS.owl#genid103 Not an
intersection/union/oneof
# Bad list first/rest subject: http://www.barc.gov.in/ISMS.owl#genid494 Not an
intersection/union/oneof
# Bad list first/rest subject: http://www.barc.gov.in/ISMS.owl#genid355 Not an
intersection/union/oneof
# Bad list first/rest subject: http://www.barc.gov.in/ISMS.owl#genid256 Not an
intersection/union/oneof

Also, it is giving some errors which i think do not exist, such as 

# http://www.barc.gov.in/ISMS.owl#isOwnedBy used as Individual and Property
# http://www.barc.gov.in/ISMS.owl#hasSystemResource used as Individual and Property
# http://www.barc.gov.in/ISMS.owl#hasCriticality used as Individual and Property

I am sure these are not true. 
The validator conclusion is tat it is not an OWL-DL ontology.

In the Protege GUI, I could execute swrl rules and do reasoner classifcation
without any problems. Now where can be the problem? I feel really confused.

thanks n regards,
Suja




Quoting Luigi Iannone <iannone at cs.manchester.ac.uk>:

> Hi Suja,
> 
> It may be the case that your ontology is really tough and challenges  
> the reasoner.
> Increasing the heap size beyond the physical limit of what you have  
> available will only slow it down further. It is very likely that your OS
> will resort to disk space in order to emulate the extra RAM, and disk  
> access is much slower than RAM access.
> 
> You might want to check that everything is alright with the ontology  
> itself. For that I suggest http://www.mygrid.org.uk/OWL/Validator with  
> the caveat that if it uses OWL2
> the validator will not cope with its latest features
> 
> Hope this helps,
> 
> Luigi
> On 1 Oct 2008, at 11:30, sujaram at barc.gov.in wrote:
> 
> >
> >
> > Hii,
> > I am using protege owl api for developing an ontology application,  
> > in eclipse.
> > Problem is that while executing Pellet reasoner, i am getting an  
> > "outOfMemory"
> > exception. I tried increasing heap size using "-Xmx500M" flag. But  
> > then system
> > is getting hanged.
> >
> > Can anyone plzz help me to proceed? My RAM size is just 256 MB. Is  
> > that the
> > cause of problem? Should I upgrade?
> >
> > regards,
> > suja.
> >
> >
> >
> >
> >
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