Github user ajs6f commented on a diff in the pull request:

    https://github.com/apache/jena/pull/314#discussion_r153815022
  
    --- Diff: 
jena-arq/src/main/java/org/apache/jena/sparql/core/assembler/InMemDatasetAssembler.java
 ---
    @@ -20,54 +20,45 @@
     
     import static org.apache.jena.assembler.JA.data;
     import static org.apache.jena.query.DatasetFactory.createTxnMem;
    -import static org.apache.jena.query.ReadWrite.WRITE;
     import static org.apache.jena.riot.RDFDataMgr.read;
     import static 
org.apache.jena.sparql.core.assembler.AssemblerUtils.setContext;
    -import static 
org.apache.jena.sparql.core.assembler.DatasetAssemblerVocab.pGraphName;
    -import static 
org.apache.jena.sparql.core.assembler.DatasetAssemblerVocab.pNamedGraph;
    -import static 
org.apache.jena.sparql.util.graph.GraphUtils.getAsStringValue;
    -import static 
org.apache.jena.sparql.util.graph.GraphUtils.multiValueResource;
    +import static 
org.apache.jena.sparql.core.assembler.DatasetAssemblerVocab.*;
    +import static org.apache.jena.sparql.util.graph.GraphUtils.*;
     
     import org.apache.jena.assembler.Assembler;
     import org.apache.jena.assembler.Mode;
    -import org.apache.jena.assembler.assemblers.AssemblerBase;
     import org.apache.jena.query.Dataset;
     import org.apache.jena.rdf.model.Resource;
    +import org.apache.jena.system.Txn;
     
     /**
      * An {@link Assembler} that creates in-memory {@link Dataset}s.
      */
    -public class InMemDatasetAssembler extends AssemblerBase implements 
Assembler {
    +public class InMemDatasetAssembler extends DatasetAssembler {
     
         public static Resource getType() {
    -        return DatasetAssemblerVocab.tDatasetTxnMem ;
    +        return DatasetAssemblerVocab.tMemoryDataset ;
         }
         
        @Override
        public Dataset open(final Assembler assembler, final Resource root, 
final Mode mode) {
    -           checkType(root, DatasetAssemblerVocab.tDatasetTxnMem);
    --- End diff --
    
    One of my frustrations with this is that there were no tests of these 
assemblers at all when I started, so I'm not very sure about the current 
expected/guaranteed behavior. WRT to our comments above about the use of 
predicates, should we start migrating people away from `ja:graph`, or (probably 
better) instead restricting `ja:data` to _only_ loading quads into a dataset?


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