component instance class spec. in XML builder script is invalid with respect to DTD

Component instance class spec. in XML builder script is invalid with respect to its DTD:

<!DOCTYPE container PUBLIC "-//NanoContainer//DTD NanoContainer XML 1.0//EN" "http://nanocontainer.org/dtd/nanocontainer-xml-1_0.dtd">
<container>
<component-instance key="com.example.MyService">
<com.example.MyServiceImpl/> <!-- This line is invalid -->
</component-instance>
</container>

P.S. yes, such construction cannot be validated with DTD, but this one could be:
<component-instance key="com.example.MyService">
<instance-specification class="com.example.MyServiceImpl"/>
</component-instance>