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Three Optional Fields in a XML file but at least on of them is required

ismail hassani
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I'am trying to implement a validation rule for an XML file,in wich three elements element 1,element2 and element3 are optional,but it's necessary to have at least one of them.

<xs:element name="element1" minOccurs="0" maxOccurs="unbounded">
<xs:element name="element2" minOccurs="0" maxOccurs="unbounded">
<xs:element name="element2" minOccurs="0" maxOccurs="unbounded">[/i]

Is it possible to implement this validation rule in XSD ?

Thank you
I agree. Here's the link:
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