sjsxp issue 48:

DTDEvent instances constructed via event reader are missing the notation and
entity declaration information. Fortunately both are available via stream
reader; so modifying XMLEntityManager's DTDEvent construction with code similar
to this:

                    DTDEvent dtd = new DTDEvent(streamReader.getText());
                    List ents = (List)
streamReader.getProperty(PropertyManager.STAX_ENTITIES);
                    if (ents != null) {
                        dtd.setEntities(ents);
                    }
                    List notations = (List)
streamReader.getProperty(PropertyManager.STAX_NOTATIONS);
                    if (notations != null) {
                        dtd.setNotations(notations);
                    }
                    event = dtd;
                }

seems to resolve the problem (StaxTest, TestEventReader#testValidDtdEvent passes
with the fix)