• To: "Dave Yancey" <dyancey1@h...>,<xml-dev@l...>
• Subject: RE: XML-Schema Help
• From: "Dare Obasanjo" <dareo@m...>
• Date: Fri, 16 Aug 2002 10:27:44 -0700
• Thread-index: AcJFSLLdEUI+VzvkQyacUtuuPwNySwAASvSm
• Thread-topic: XML-Schema Help

I'm not sure I understand your question. The content model of a type definition only appears in an instance document if an instance of the type is used in the document. Also, in the content model are you trying to say 
 
  one or the other but not both 
 
or 
 
 neither, one or both 
 
because your schema fragment describes the latter although I suspect you want the former. 

	-----Original Message----- 
	From: Dave Yancey [mailto:dyancey1@h...] 
	Sent: Fri 8/16/2002 10:12 AM 
	To: xml-dev@l... 
	Cc: 
	Subject:  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
	david_yancey@h...
	
	
	<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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