<?xml version="1.0" encoding="utf-8"?>
<!ELEMENT article (title?, author?, annotation?, body?)>
<!ATTLIST article
	id CDATA #REQUIRED
	lang CDATA #REQUIRED
>
<!ELEMENT title (#PCDATA)>
<!ELEMENT author (#PCDATA)>
<!ELEMENT annotation (#PCDATA)>
<!ELEMENT body (section+)>
<!ATTLIST section
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>
<!ELEMENT section (#PCDATA | keyword)*>
<!ELEMENT keyword (#PCDATA)>