6.10 Conditional Sections

<![ IGNORE [ declarations ]]>

<![ INCLUDE [ declarations ]]>

<!ENTITY % article "INCLUDE">
<!ENTITY % book "IGNORE">
<![%article;[
<!ELEMENT body (chapter, (section | subsection)* )*>
]]>
<![%book;[
<!ELEMENT body (section | subsection)* >
]]>

Enables parse-time customization and DTD modularization (e.g., choose desirable sections from a large DTD).

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