assertTrue(type instanceof ProcessingElementType);
ProcessingElementDescriptor descriptor =
((ProcessingElementType)type).getDescriptor();
ProcessingElementInputDescriptor input = descriptor.getInput("vectors");
assertTrue(input.isArray());
DTypeRepresents dtype = (DTypeRepresents)input.getDType();
assertNotNull(dtype);
assertEquals("http://example.com", dtype.getRepresents().getNamespace());
assertEquals("Vector", dtype.getRepresents().getLocalName());
}