How to restrict an element to be non-empty through xsd -

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i need restrict elements in xml file non empty using xsd files. can force elements contain cdata sections?

the tool have xs:string pattern restriction in below. cdata alternative escaping entity references. should use entity references in pattern.

<simpletype name="newtype2">     <restriction base="string">         <minlength value="5"></minlength>         <maxlength value="30"></maxlength>         <pattern value="(&lt;html&gt;).*(&lt;/html&gt;)"></pattern>     </restriction> </simpletype>

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