看来您的地图无效。希望这个例子对你有所帮助。
myMap.ditamap
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE map PUBLIC "-//OASIS//DTD DITA Map//EN" "map.dtd">
<map>
<title>Title of Your Map</title>
<!-- Reference to the Topic -->
<topicref keys="myTopic"/>
<!-- Your Keymap -->
<mapref href="myKeymap.ditamap" format="ditamap"/>
</map>
myKeymap.ditamap
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE map PUBLIC "-//OASIS//DTD DITA Map//EN" "map.dtd">
<map>
<title>My Keymap</title>
<keydef keys="myTopic" href="myTopic.dita"/>
<keydef keys="myFile" href="myFile.xlsx" navtitle="myFile" scope="external" format="xlsx"/>
</map>
我的主题.dita
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic id="myTopic">
<title>myTopic</title>
<body>
<p>This is a link to myFile.xlsx: <xref keyref="myFile"/>.</p>
</body>
</topic>