<!ELEMENT manualpage (parentdocument?, title, summary?,
seealso*, section*)>
-<!ATTLIST manualpage metafile CDATA #REQUIRED>
+<!ATTLIST manualpage metafile CDATA #REQUIRED
+ upgrade CDATA #IMPLIED
+>
<!-- <sitemap> is the root element -->
<!ELEMENT sitemap (title, summary?, seealso*, category*)>
-<!ATTLIST sitemap metafile CDATA #REQUIRED>
+<!ATTLIST sitemap metafile CDATA #REQUIRED
+ upgrade CDATA #IMPLIED
+>
<!-- <indexpage> is another root element -->
<!ELEMENT indexpage (parentdocument, title, category*)>
-<!ATTLIST indexpage metafile CDATA #REQUIRED>
+<!ATTLIST indexpage metafile CDATA #REQUIRED
+ upgrade CDATA #IMPLIED
+>
<!ELEMENT category (title, page*)>
<!ATTLIST category id ID #IMPLIED>