I discovered DatasetAssemblerVocab which helped me realize I was using a wrong prefix. So, looks like this will do it:
@prefix ja: <http://jena.hpl.hp.com/2005/11/Assembler#> . <#dataset> rdf:type ja:DatasetNull . > On Tuesday, October 29, 2013 11:10 AM, Tim Harsch <harschw...@yahoo.com> > wrote: > > Does anyone have an example of creating a GraphStoreNull or > GraphStoreNullTransactional using an assembler configuration file? >