spec = FileManager.get().loadModel(assemblerFile) ;
} catch (Exception ex)
{ throw new ARQException("Failed reading assembler description: "+ex.getMessage()) ; }
Resource root = null ;
InfoLevel level = ARQ.getExecutionLogging() ;
ARQ.setExecutionLogging(InfoLevel.NONE) ;
try {
root = GraphUtils.findRootByType(spec, type) ;
if ( root == null )
return null ;