ELEMENT optionale SE
<!DOCTYPE student [
<!ELEMENT student (name,vorname)>
<!ELEMENT vorname (echter,spitz?)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT echter (#PCDATA)>
]>
<student>
<name>Dürkop</name>
<vorname>
<echter>Henning</echter>
</vorname>
</student>
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