[Owlim-discussion] Efficiently Loading Data into Remote Repository

[Tony Scerri]

Hi

This maybe more of a Sesame API related question than specificaly related to
OWLIM. However as I'm using BigOWLIM behind a Sesame Server I thought i'd
ask here anyway. I'm relatively new to the various stores, servers, APIs
invovled so getting a feel for how best to do things. The first task is
loading RDF in my case OWL files. I have two setups one requiring to pull
down OWL files off the web, another using local files. My setup has a Sesame
2.3.1 remote repository behind which I have a variety of stores (just
getting to graps with the various options). However I'm looking at ways to
populate them with OWL ontologies including referenced imports. I have a
setup which now works and looks for missing import in the repository and
goes off to pull those down.

What I noticing is its very slow, compared with say using the Workbench and
manually adding the OWL files one at a time. Through the Sesame API it seems
there a variety of calls that could be made (namely the add methods on the
repository connection), either passing in one statement at a time (assuming
I had parsed the RDF) or you can supply a File, URL or input stream. I'm
trying to figure out which would be the most efficient method to be calling
from a client machine when dealing with both web base and local file based
resources. I believe setting the auto commit may have an impact on  this too
and was looking at the Sesame source code to see what the various calls do
in this regard, but I wanted to hear what others already using this have
experienced.

One other minor question regarding imports, i have seen other examples of
code to resolve missing imports and load them, some seem to ignore the RDFS
and OWL URIs and do not load those, others simply process anything. Again
just wondering which if any its necessary to import (is this because the
information is already contained within the repository explicitly or as part
of the querying/inferening support).

Thanks

Tony

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