Github user afs commented on the issue: https://github.com/apache/jena/pull/159 That will go in circles! Plain `model.read` goes to `RDFReaderRIOT` (The old RDFReader interface adapter to RIOT) which makes all calls go to `RDFDataMgr.read(model,...)`. If that calls `model.read` we have a loop. `OntModel.read` overrides `Model.read` and does "get basic data" via a call to `super.read` (which is `ModelCom.read`) and then "load imports". So the layering is that RDFDataMgr does the basic read operations, with the indirection of `StreamManager`/`LocationMapping`. The key here is going via `FileManager.get().readModel` bypasses an overridable `model.read`.
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