We have contacted TrOWL team. We will post a response once we hear from them.
Got the following response from Dr. Jeff Z Pan.
Hope it helps,
But Protégé is having a problem with a few 100000 triples read from the
the Nosql DB, so this option is very limited.
A few 100,000 triples should still be doable in memory. This problem can
be caused by the implementation of Protégé, or the reasoner plug-ins, or the complexity involved. Please give OWL-DBC a try and see how it works.
Is there a way to do streaming with Trowl or Pellet?
TrOWL supports memory-based stream reasoning.
What if my RDF data are in the Billions of triples ?
Follow the best practice in the white paper of OWL-DBC. More precisely,
1) if the dataset contains a relatively small schema (TBox) and a large
potion f data (ABox), you should use TrOWL to classify the TBox and use
Oracle native inference engine to handle the much larger Abox. The
reasoning might be incomplete, if the given Tbox is beyond OWL 2 QL.
2) if the schema (Tbox) is to large to be handled in memory, you should
cut it into smaller pieces so that each piece can be reasoned with in
memory and independently. The reasoning might be incomplete, if the
Tbox is not modularisable.
Thanks. OK let me try that on my data set. I will post the result ASAP
How can I make OWL-DBC work together with Oracle NoSQL? To my uunderstanding OWL-DBC is only meant to work with Oracle Spatial and Graphs.
Here is what I tried :
OracleNoSqlConnection conn = OracleNoSqlConnection.createInstance(szStoreName, szHostName, szHostPort); OracleGraphNoSql graph = new OracleGraphNoSql(conn); // initialise and oracle semantic model model = new OracleModelNoSql(graph); // create OWL-DBC object for an Oracle semantic model OWLDBC odbc = new OWLDBC(model);
Error -->Multiple markers at this line
- The type oracle.spatial.rdf.client.jena.ModelOracleSem cannot be resolved. It is indirectly referenced from required .class files
- The constructor OWLDBC(ModelOracleSem) refers to the missing type ModelOracleSem
I don't think that Trowl OWL-DBC works with Oracle NoSQL. OWL-DBC is for Oracle Spatial and Graphs. Is there a way to use standard Trowl with streaming on large volumes of data?
I would like to generate the inferred triples into an N-Triples file on a Linux machine and the import the result into Oracle NoSQL or Oracle Spatial & Graphs. We talk about 5 billion triples to be inferred. I could also provide the inferred triples to Trowl as a set of files instead of reading from the DB....
Looks like you have a very interesting use case. Please contact me offline (alan dot wu at oracle dot com). I'd like
to know a bit more details about your application.