Question

I am in the process of creating an XML Schema and one of my values is a year. As such, I’d like to ensure that all values have exactly 4 characters. To do so, I am using the following syntax:

<xs:element name='publish_year' maxOccurs='1'>   <xs:simpleType>     <xs:restriction base='xs:positiveInteger'>       <xs:totalDigits value='4'/>     </xs:restriction>   </xs:simpleType>                                       </xs:element> 

If I’m understanding ‘totalDigits’ correctly, someone could pass in a ‘publish_year’ value of ‘2008’ or ‘200’. Both would be valid. As such, how can I structure my XSD to ensure 4 digits are required? At first blush, I’m guessing I’d use a regex, but I’d like to know if I’m overlooking something that’s already baked in (like ‘totalDigits’)

UPDATE:

I went with the following solution. It may be overkill, but it gets the point across:

<xs:simpleType>     <xs:restriction base='xs:positiveInteger'>         <xs:totalDigits value='4' fixed='true'/>         <xs:minInclusive value='1900'/>         <xs:pattern value='^([1][9]\d\d|[2]\d\d\d)$'/>     </xs:restriction> </xs:simpleType> 

Answer 1

How about a plage of value as an additional restriction ?

(minInclusive – maxInclusive)

For instance ?

<xs:minInclusive value='1900'/> et <xs:maxInclusive value='2008'/> 

But to get back to the totalDigits constraint, why do you not set the fixed attribute to true ?

If {fixed} is true, then types for which the current type is the {base type definition} cannot specify a value for totalDigits other than {value}.

<xs:totalDigits value='4' fixed='true' />