Require at least one optional unique child?

This should cover W3C XML Schema, Relax NG and DTD related problems.
Posts: 5

Require at least one optional unique child?

Tue Sep 18, 2007 8:14 pm

Is there a way to require the parent element (searchRequest) to have at least one child given the following code? Each child element should occur either once or not at all.

<xs:element name="searchRequest">
<xs:element name="freeText" type="xs:string" minOccurs="0"/>
<xs:element name="before" type="xs:date" minOccurs="0"/>
<xs:element name="after" type="xs:date" minOccurs="0"/>
<xs:element name="status" minOccurs="0">
<xs:restriction base="xs:string">
<xs:enumeration value="active"/>
<xs:enumeration value="complete"/>
<xs:enumeration value="onhold"/>

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