Re: Curious about setProcessImports(false)

[Steve Vestal]

OK

On 12/24/2020 11:59 AM, Andy Seaborne wrote:

Steve - could you send this to the list please?  More OntModel experts there!

    Andy

On 24/12/2020 17:18, Steve Vestal wrote:

What I did as part of exploring things was





On 12/24/2020 10:59 AM, Andy Seaborne wrote:

             Model baseModel = ModelFactory.createModelForGraph(myDummyGraph);              OntModel wrapperModel = ModelFactory.createOntologyModel(leafModelSpec, baseModel); where myDummyGraph was a Graph implementation I could observe to see what calls were made, and leafModelSpec is as specified previously.  A call was made to find all owl:Imports (a triple of the form <*> <owl:Imports> <*>) during execution of the call to createOntologyModel.

On 24/12/2020 13:49, Steve Vestal wrote:

I am doing my own import closure, and I saw some behaviors that I was a bit curious about.  For my own education, I'd appreciate any observations you might have.

I call setProcessImports(false) when creating the document manager, but 1) my OntModel gets created as a UnionModel,

There is a comment in the code:


    protected MultiUnion m_union = new MultiUnion();

There is always a union, even if union of one.



The code is OntModelImpl.generateGraph

    /** The union graph that contains the imports closure - there is always one of these, which may also be _the_ graph for the model */ Because imports may change as add/deletes happen 9including setSubModel), always being a union is probably a lot easier than having a special case.

and 2) a query is made to OntModel#getGraph() to find all owl:Imports.

when does this happen? It does not seem to happen with the setup code you gave.

  I thought these would be unnecessary with setProcessImports(false). Is there any non-negligible overhead, or processing I am not anticipating, going on?

    Andy

  Are there additional properties I should be setting?  Is it the case that setProcessImports(false) has no effect on how the overall structure is assembled, but it does stop the actual creation of new sub-models and the loading of those imported documents?

As background, I am constructing the sort of tree shown in section /Compound Ontology Documents and Imports Processing/ on page https://jena.apache.org/documentation/ontology/.  I do some custom ontology management, and my code processes all imports, OWL and otherwise.  Some of the leaf (non-base) models are OntModels.  I am loading those leaf OntModels as

             leafDocMgr = new OntDocumentManager();
             leafDocMgr.setFileManager();
             leafDocMgr.setProcessImports(false);
             leafDocMgr.setCacheModels(false);
             leafModelSpec = new OntModelSpec(OntModelSpec.OWL_MEM);
             leafModelSpec.setDocumentManager(leafDocMgr);

             OntModel leafOntModel = ModelFactory.createOntologyModel(leafModelSpec);

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