DTD for Recursive XML

[ygelman]

Hello forum.
I'm starting my first project that should use XML.
And here I have question about DTD.
I have to create recursive tree that simulates directory tree:
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<?XML version=&quot;1.0&quot;?>
<TREE_MENU_NESTED>
<TREE ICON=&quot;File&quot; ACTION=&quot;URL&quot; LINK=&quot;

http://domain/file&quot;

TARGET=&quot;_blank&quot;>Home</TREE>
<TREE ICON_OPEN=&quot;Folders&quot; ICON_CLOSED=&quot;Folders&quot; OPENED=&quot;TRUE&quot;>Calendar
<TREE ICON=&quot;File&quot; ACTION=&quot;URL&quot; LINK=&quot;

http://domain/file&quot;

TARGET=&quot;_blank&quot;>Business</TREE>
<TREE ICON=&quot;File&quot; ACTION=&quot;URL&quot; LINK=&quot;

http://domain/file&quot;

TARGET=&quot;_blank&quot;>Social</TREE>
</TREE>
<TREE ICON_OPEN=&quot;Folders&quot; ICON_CLOSED=&quot;Folders&quot; OPENED=&quot;TRUE&quot;>Departments
<TREE ICON_OPEN=&quot;Folders&quot; ICON_CLOSED=&quot;Folders&quot; OPENED=&quot;TRUE&quot;>IT
<TREE ICON_OPEN=&quot;Folders&quot; ICON_CLOSED=&quot;Folders&quot; OPENED=&quot;TRUE&quot; ACTION=&quot;URL&quot; LINK=&quot;

http://domain/file&quot;>Projects

<TREE ICON=&quot;File&quot; ACTION=&quot;URL&quot; LINK=&quot;

http://domain/file&quot;

TARGET=&quot;_blank&quot;>Reporting</TREE>
</TREE>
<TREE ICON=&quot;File&quot; ACTION=&quot;URL&quot; LINK=&quot;

http://domain/file&quot;

TARGET=&quot;_blank&quot;>Service Request</TREE>
</TREE>
</TREE>
</TREE_MENU_NESTED>

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How should I write DTD for it. As I uderstood from the book I have on XML I can't create the recursive elements in DTD