On 22/02/12 12:54, 月之子 wrote:
As we know ,if we want to parse a OWL file ,we always read in it and
then create a OntModel with the ModelFactory. But this will encounter
a problem when reading a large file,for example the file size is
larger than 50MB.Java will throw an exception for : JAVA heap
space,because of the limitation of memeory.
So is that mean I can't
parse large OWL file with JENA and get the OntModel?
No it doesn't. You have a couple of options:
* 50Mb is not that large compared to most modern computers. If you need
to, allocate the Java process a larger heap with the -Xmx option when
you start the JVM
* read the model into a persistent model, such as TDB. Then, create the
OntModel as a wrapper around the TDB model:
Model tdbBaseModel = .... ;
OntModel m = ModelFactory.createOntologyModel(
OntModelSpec.OWL_MEM,
tdbBaseModel );
and then carry on as normal.
NOTE: the second strategy will not perform very well if you use an
OntModel with inference (e.g. OWL_MEM_MICRO_RULE_INF). If you need
inference, just increase the Java heap size.
Ian
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