<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE root [
<!ELEMENT root (#PCDATA|child|child2)*>
<!ELEMENT child (#PCDATA)>
<!ELEMENT child2 (#PCDATA)>
]>
<root>
    This is a character data.
    <child>
        This is a character data under `child`.
    </child>
    <child2>
        This is a character data uder `child2`.
    </child2>
</root>