<document source="test data">
<paragraph>
Duplicate implicit/explicit targets.
<section dupnames="title" ids="title">
<title>
Title
<system_message backrefs="id1" level="1" line="6" source="test data" type="INFO">
<paragraph>
Duplicate explicit target name: "title".
<target ids="id1" names="title">
<paragraph>
Paragraph.