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cdesktop/cde/programs/dtdocbook/sgmls/test/test040.sgm

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<!doctype doc [
<!element doc - o (a*) +(r)>
<!element a - o (t,(s|r))>
<!element (r|s|t) - - (#pcdata)>
]>
<doc>
<a>
<t></>
<r></r>