Github user afs commented on the issue:
https://github.com/apache/jena/pull/314
`ja:data` isn't mentioned in `DatasetAssembler` except to redirect to TIM.
Which two different kinds of dataset?
Would you like to move `public static final Property data = property(
"data" );` out of JA.java into the assembler vocab definitions file?
We need a way to say:
```
<#dataset> a ja:MemoryDataset ;
ja:data "File for the default graph - also data for dataset" ;
ja:namedGraph [ ja:graphName "http://example/graph1";; ja:data "File for
graph1" ] ;
ja:namedGraph [ ja:graphName "http://example/graph2";; ja:data "File for
graph2" ] ;
.
```
because that gets a fully transactional dataset and I'd hope our preferred
way to do have plain data in a memory dataset. Having data-for-triples,
data-for-quads gets weird when its an unknown URL to load from for the default
graph.
`ja:Content` is for `ja:Model`s in `ja:RDFDataset` only. It is too old (=
documented and written about outside the project) to drop. It is needed for
inference setups.
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