<?xml version='1.0'?>
<!DOCTYPE root [
    <!NOTATION myNotation SYSTEM 'http://www.example.com' >
    <!ELEMENT root (foo | bar | baz)> <!ELEMENT foo (string, bar)>
    <!ELEMENT bar (#PCDATA)> <!ELEMENT baz (#PCDATA)>
    <!ELEMENT string (#PCDATA)>
    <!ELEMENT fooBar (foo | bar)*>
    <!ELEMENT img EMPTY>
    <!ATTLIST foo
        src CDATA   #REQUIRED
        id  ID      #IMPLIED
        print (yes | no) "yes"
    >
]>
<root>
    <foo src='hello'>
        <string>Hello</string>
        <bar>world</bar>
    </foo>
</root>