1<?xml version="1.0"?>
2<!DOCTYPE doc [
3<!ELEMENT doc (#PCDATA)>
4<!ATTLIST doc At NMTOKEN "$$$">
5<!ATTLIST doc Ok NMTOKEN "1abc_2">
6<!ATTLIST doc bad IDREF "1abc_2">
7<!ATTLIST doc ok2 IDREF "abc_2">
8<!ATTLIST doc bad2 IDREFS "abc:1 1abc_2">
9<!ATTLIST doc ok3 IDREFS "abc:1 a1bc_2">
10]>
11<doc val="v1"/>
12
13