XML-Schema Help

Hello all,

I've been following the threads here for a while and have learned a great 
deal from everyone.

My question is this, in a Schema is it possible to have an element be 
required only if its parent element exists.

For example in the code below if timeframetype exists then either
earliestdate or latestdate would be required, 1 or the other but both are 
not required.

Thanks for any help in advance.

David Yancey



<xs:complexType name="timeframeType">
	<xs:sequence>
		<xs:element ref="description"/>
		<xs:element ref="earliestdate" minOccurs="0"/>
		<xs:element ref="latestdate" minOccurs="0"/>
	</xs:sequence>
</xs:complexType>


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