<!-- Fig. B.12: conditional.dtd          -->
<!-- DTD for conditional section example -->

<!ENTITY % reject "IGNORE">
<!ENTITY % accept "INCLUDE">

<![ %accept; [
   <!ELEMENT message ( approved, signature )>
]]>

<![ %reject; [
   <!ELEMENT message ( approved, reason, signature )>
]]>

<!ELEMENT approved EMPTY>
<!ATTLIST approved flag ( true | false ) "false">

<!ELEMENT reason ( #PCDATA )>
<!ELEMENT signature ( #PCDATA )>

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