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POHow to interpret default values of primitive types in XSD when minoccurs=0
 

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  1. POHow to interpret default values of primitive types in XSD when minoccurs=0
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    <p>Inside an xs:complexType, there are elements: </p> <p>Running .NET tools like SvcUtil.exe, you will get a class decorated with DataContractAttribute containing properties: public string RegistrationNumber {get;set;} public DateTime ExpiryDate {get;set;} public DateTime? RegistrationEndDate {get;set;}</p> <p>What puzzle me is: if the XML instance received does not contact these 3 elements, apparently default values will be used though default values are not explicitly defined in XSD. What default values for string and Datetime?</p> <p>To refresh my deem memory, I have a look at</p> <h1><a href="http://www.w3.org/TR/xmlschema-0/" rel="nofollow">http://www.w3.org/TR/xmlschema-0/</a></h1> <p>2.2.1</p> <h1>In summary, the differences between element and attribute defaults can be stated as: Default attribute values apply when attributes are missing, and default element values apply when elements are empty.</h1> <p>So what if the default value is no explicitly defined and an element is empty/absent?</p> <p>The standard does not seem to define for such scenario, but apparently this will be at the mercy of the implementation of the receiver. </p> <p>For data type like integer and boolean, the default values are obvious: 0 and false. Well defined since day 1 of electronic computing.</p> <p>But for string and datetime, the situation is a bit tricky, largely because different languages have different structures and conventions for string and datetime.</p> <p>Do you think my understanding is correct?</p> <p>In MSDN about DataMemberAttribute.EmitDefaultValue, there is a statement:</p> <p>"Setting the EmitDefaultValue property to false is not a recommended practice. It should only be done if there is a specific need to do so (such as for interoperability or to reduce data size). "</p> <p>Can you tell me why this is not a recommended practice? say, sound like MS recommend emitting every elements regardless if minOccurs=0 in XML message?</p> <p>Thanks</p> <p>Andy</p>
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