This bug turned out to be that 2005/ajar/ajaw/data.rdf and data.n3 were both
still calling the namespace "tab" http://dig.csail.mit.edu/2005/ajar/ajaw/ont# ,
which was then overwriting our internal namespace.  This is a serious bug,
seeing as it breaks things that use the tabulator ontology.  We fixed it by
changing the files to the proper URI, but it is worth noting that this bug is
definitely very fixable and definitely needs to be fixed.