public Object open(Assembler a, Resource root, Mode mode)
{
LARQ.init();
if ( ! GraphUtils.exactlyOneProperty(root, LARQAssemblerVocab.pIndex) )
throw new AssemblerException(root, "Required: exactly one index property" ) ;
try
{
String indexPath = GraphUtils.getAsStringValue(root, LARQAssemblerVocab.pIndex) ;
return make(null, indexPath) ;