1 <!DOCTYPE doc

     2 [

     3 <!ELEMENT doc (#PCDATA|a|b|c|d)*>

     4 <!ELEMENT a EMPTY>

     5 <!ELEMENT b EMPTY>

     6 <!ELEMENT c EMPTY>

     7 <!ELEMENT d EMPTY>

     8 <!ATTLIST a>

     9 <!ATTLIST b >

    10 <!ATTLIST c att CDATA #IMPLIED>

    11 <!ATTLIST d att CDATA #IMPLIED>

    12 <!ATTLIST

    13 c att CDATA

    14  #IMPLIED

    15 att2

    16  CDATA

    17  "second declaration is OK"

    18 att2 CDATA

    19  #REQUIRED

    20  >

    21 <!ATTLIST d>

    22 ]>

    23 <doc><c/><c att2="test"/></doc>