Github user afs commented on the pull request: https://github.com/apache/jena/pull/94#issuecomment-151159560 The datastructure code in jena-base:org.apache.jena.atlas.lib. As things stand today "dataset" related stuff needs to go in jena-arq. In jena-core+jena-arq is one thing, split for historical and "not too big" reasons. A reorganisation, e.g. DatasetGraph+Quad next to Graph and Triple, would be disruptive to many applications unfortunately.
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