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RE: Basic XSD question

• To: "Robert Soesemann" <rsoesemann@s...>, <xml-dev@l...>
• Subject: RE: Basic XSD question
• From: "Chiusano Joseph" <chiusano_joseph@b...>
• Date: Fri, 10 Dec 2004 11:44:20 -0500
• Thread-index: AcTe1RrmDO8xNq4zTjevW8/krTyJ9wAAZZ8g
• Thread-topic: Basic XSD question

> -----Original Message-----
> From: Robert Soesemann [mailto:rsoesemann@s...] 
> Sent: Friday, December 10, 2004 11:27 AM
> To: xml-dev@l...
> Subject:  Basic XSD question
> 
> Hello,
> 
> I have a quite basic question, but I could find a solution.
> 
> How can I define in XMLSchema that an element should provide 
> a text value? 

Use the "minLength" facet, with minLength equal to 1.
 
> When I validate the following XML with the XSD 
> I get no error, because the empty string seems to be a valid 
> string as well.

Yes, because the default for minLength is 0. The behavior you see is
therefore the expected behavior.

> XML:
> ----
> <root>
> 	<a></a> <-- if a is <a> is included it should have an 
> xs:string text node
> 	<a></a> <-- a second <a> is also not allowed </root>
> 
> XSD fragment:
> -------------
> 	<xs:element name="root">
> 		<xs:complexType>
> 			<xs:choice maxOccur="1"> <-- why does 
> it not invalidate the second <a>?

Because you've placed the maxOccurs facet on the choice, not on the
individual element - if you intend to restrict element <foo> to one
occurrence max, the maxOccurs facet has to be an attribute of the
<xs:element> element. You may also not want to use a choice there, since
there is only one possible value.

Hope that helps--

Kind Regards,
Joseph Chiusano
Booz Allen Hamilton
Strategy and Technology Consultants to the World
 
> 				<xs:element name="foo" type="xs:string"
> minOccurs="1" />
> 			</xs:choice>
> 		</xs:complexType>
> 	</xs:element>
> 
> Thanks for replies,
> 
> R.
> 
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