ELEMENT optionale SE
<!DOCTYPE student [
<!ELEMENT student (nm,vn*,info?,(hknft|gschl)?)>
<!ELEMENT nm (#PCDATA)>
<!ELEMENT vn (#PCDATA)>
<!ELEMENT gschl (#PCDATA)>
]>
<student>
<nm>Dürkop</nm>
<vn>Henning</nm>
<vn>Matthias</vn>
<gschl>männlich</gschl>
</student>
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