<!ELEMENT document ( section+ ) >
<!ELEMENT section ( title, p+, section* ) >
<!ATTLIST section
	id ID #REQUIRED
	author CDATA #REQUIRED >
<!ELEMENT title ( #PCDATA )>
<!ELEMENT p ( #PCDATA | ref )*>
<!ATTLIST p
	type CDATA #IMPLIED >
<!ELEMENT ref EMPTY >
<!ATTLIST ref
	name IDREF #REQUIRED >
