<!ELEMENT root-tag (inner-tag, a2, cdatatag)>
<!ATTLIST root-tag myattr CDATA "">

<!ELEMENT inner-tag (#PCDATA)>
<!ATTLIST inner-tag someattr CDATA "">

<!ELEMENT a2 (a3)>

<!ELEMENT a3 (a4)>

<!ELEMENT a4 (#PCDATA)>

<!ELEMENT cdatatag (#PCDATA)>

