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The current version of the TopBraid Composer user interface does not allow you to connect to an existing Oracle RDF database, because there was an issue in the handling of blank nodes that required us to make sure that databases are created in the right format. This problem has been fixed by the Oracle developers recently and we are awaiting to significatnly improve the TopBraid-Oracle bridge with the upcoming major Oracle release.
If you do not use any blank nodes in your model, there is a trick to connect to an existing model. Create a new empty database with some other name. This will create an .oracle file in your workspace. You can then manually edit the .oracle file to redirect to your existing database.
For TopBraid specific questions you may want to join the Composer mailing list.
Hope that helps,
If I use the trick described, how do I know if I am connected to the existing model? The field that is confusing me is the "DatabaseName" field in the file. Does this refer to the model name entered in the SDO_RDF.CREATE_RDF_MODEL call? or the table the model is built on? Or is it something completely different?