private void setExternalEntity(String eName, int eClass,
            ExternalIdentifiers ids, String nName) {
        if (entityInfo.get(eName) == null) {
            EntityInfo entity = new EntityInfo();
            entity.type = eClass;
            entity.ids = ids;
            entity.notationName = nName;
            entityInfo.put(eName, entity);
        }
    }
Register an external entity declaration for later retrieval.
src/nu/validator/gnu/xml/aelfred2/XmlParser.java