singletons.add(new ConstraintViolationExceptionMapper());
singletons.add(new org.graphity.client.mapper.jena.DoesNotExistExceptionMapper());
singletons.add(new org.graphity.client.mapper.jena.NotFoundExceptionMapper());
singletons.add(new org.graphity.processor.mapper.jena.QueryExceptionHTTPMapper());
singletons.add(new ModelXSLTWriter()); // writes XHTML responses
singletons.add(new XSLTBuilderProvider()); // loads XSLT stylesheet
}