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https://issues.apache.org/jira/browse/JENA-205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13196494#comment-13196494
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Rob Vesse commented on JENA-205:
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Streaming RDF/XML is not that hard if you are willing to either have very
verbose output i.e. a <rdf:Description> element per triple or to do some
limited buffering and write out in small batches.
You'd just have to be careful that you always add rdf:nodeId where blank nodes
are involved so that you don't rely on anonymous identifiers at all.
I'd very much like to see a streaming API for this as I have at least one piece
of code where I want that capability and haven't had the time to try and
implement it myself yet. Iterator<Triple> would be my preference as well and I
agree that doing the distinct on the server is unnecessary.
> Streaming results for CONSTRUCT queries
> ---------------------------------------
>
> Key: JENA-205
> URL: https://issues.apache.org/jira/browse/JENA-205
> Project: Jena
> Issue Type: Improvement
> Components: ARQ, Fuseki
> Reporter: Stephen Allen
> Assignee: Stephen Allen
> Priority: Minor
>
> It would be useful to have CONSTRUCT queries that streamed results. An
> additional method on QueryExecution that returned an Iterator<Statement> (or
> something similar to that [1]) would provide the necessary access.
> Implementationwise, the application of Bindings to the CONSTRUCT template is
> already streaming, we would simply need to perform a distinct operation on
> the Triples that are created. We could use a DistinctDataNet to get
> semi-streaming with spill-to-disk functionality.
> Additionally, for this to be useful for Fuseki, we also need an RDF/XML
> serializer that can operate on an Iterator<Statement> instead of a Model.
> [1] Prefix mappings would probably be nice for serializers that consume this
> iterator.
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