hi,
I have a medical ontology stored with Jena tdb.
the object model is quite simple:
1. we have medical concepts that have the following fields: code, code system 
(explain it on #3) a unique id and text.
2. Medical relations between these
concepts.
3. becuase medical concepts are produced from a certain code system we have an 
object for that which is the container for the concepts (details of it are not 
important).

all of the data of course is stored as triples, where as for medical concepts 
the id is the triple identifier.

when I query for all the concepts of a code system the result is huge and I 
would like to get it by paging.
now I do support it by using limit offset and sorting  but it's extremely slow 
because of the sorting every time I ask for the next bulk.
is their a way to do so without sorting, maybe use index?

thanks,
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