ontlearner70 wrote:

> hi, I am very new in this field and have just started learning the
> ontologies and have tried to read and write the ontologies using jena
> 2.1, but i want to know wat is the process if i want to use them
> ontologies in information retrieval/extraction process,

Jena is not itself an information extraction toolkit, it is an RDF/OWL
toolkit which you could apply to information retrieval/extraction problems.

The sorts of things you can do in Jena itself is to create an inference
model which combines your ontology with your instance data and query that
to see inferred facts. For example, if your ontology says a Person is a
subClass of Animal, your instance data says that Dave is a Person then a
query to the inference model asking for Animals will return Dave.

However, Jena does not itself have any built in natural language processing
facilities - you would need to combine it with other toolkits such as GATE
to perform information exraction from free text.

> moreover i am
> having problems in schemagen.

If you can describe your problem someone may be able to help.

Dave