working with big owl files

Question

Im working on a project where my plan is to get the topic name(hierarchy in the tree given a word) for eg:given stack i need to get Datastructures, given chemotherapy is should be gettig somethig like chemistry etc.., i Have used DL query tab on some ontology which is very big and i don't get find a specific ontology .owl file where i can get the higher level topic name. i wrote the DL query tab program which runs out of heap space given a query.problems are

• The ontology i have contains many words but i fail to retrieve the hierarchy(superclass,subclass),

• the ontology asks for manchester syntax while i have a simple word--how can i map the word to the class in an ontology

• IS there a way we can find the topic name like the example given a set of words using some owl ontology

Answer 1

For an OutOfMemory error, use -Xmx to increase the amount of heap memory available. For example, -Xmx2000M will give two gigabytes of memory to Protege.

You are probably starting Protege from a script; if you edit it, you'll find the option, with a smaller number, already there. You can edit that file to increase the amount.