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[protege-owl] protege owl api :outofmemory exception

Martin O'Connor martin.oconnor at stanford.edu
Wed Oct 1 16:23:56 PDT 2008


SWRL rules are encoded using RDF constructs so the validator will 
complain any OWL file that contains SWRL rules. You can ignore these 
errors - they do affect reasoning.

Martin

sujaram at barc.gov.in wrote:

>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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>>
>
>
>
>
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