} else if(s.indexOf(RELATIONSHIP_PREFIX) == 0) {
int entityOffset = s.indexOf(ENTITY_PREFIX);
String entityName = s.substring(entityOffset + ENTITY_PREFIX.length());
String relationshipName = s.substring(RELATIONSHIP_PREFIX.length(), entityOffset);
EOEntity entity = EOModelGroup.defaultGroup().entityNamed(entityName);
o = entity.relationshipNamed(relationshipName);
} else if(s.indexOf(ATTRIBUTE_PREFIX) == 0) {
int entityOffset = s.indexOf(ENTITY_PREFIX);
String entityName = s.substring(entityOffset + ENTITY_PREFIX.length());
String attributeName = s.substring(ATTRIBUTE_PREFIX.length(), entityOffset);
EOEntity entity = EOModelGroup.defaultGroup().entityNamed(entityName);