在lxml中，可以使用include和fallback指令來實現XML文檔的模塊化解析。
<!DOCTYPE html [
<!ENTITY myInclude SYSTEM "included.xml">
]>
<html>
&myInclude;
</html>
<!DOCTYPE html [
<!ENTITY myInclude SYSTEM "included.xml" NDATA fallback>
]>
<html>
&myInclude;
</html>
通過使用include和fallback指令，可以更好地實現XML文檔的模塊化解析，提高XML文檔的可維護性和可讀性。
