XSD: Different Restriction by Attribute Values - attributes

Question

I'm new in XSD and have the following question, thanks a lot for your help!
Suppose I have the xml:
<DataGroup>
<Data name="name">Jane</Data>
<Data name="age">50</Data>
<Data name="state>MA</Data>
<Data name="zipcode">01000</Data>
</DataGroup>
I'd like to put restriction on:
when the attribute name equals to "age", the value of should be an integer and >20,
when the attribute name equals to "state", the value of should be two letters.
when the attribute name equals to "zip code", the value of should be \d{5}.
Can not modify the xml, any idea?
Thanks!

Answer 1

Using XSD 1.1 you can declare alternative types for each situation. Additionally you can restrict the number of <Data> elements to exactly four, and add an assertion to guarantee that each different attribute occurs exactly once:
<xs:element name="DataGroup">
<xs:complexType>
<xs:sequence>
<xs:element name="Data" maxOccurs="4" minOccurs="4">
<xs:alternative type="NameData" test="#name='name'" />
<xs:alternative type="AgeData" test="#name='age'" />
<xs:alternative type="ZipData" test="#name='zipcode'"/>
<xs:alternative type="StateData" test="#name='state'"/>
</xs:element>
</xs:sequence>
<xs:assert test="Data/#name='name' and Data/#name='age' and Data/#name='zipcode' and Data/#name='state'"></xs:assert>
</xs:complexType>
</xs:element>
Since <Data> is a simple type, you need to declare the attribute as an extension of each type:
<xs:complexType name="NameData">
<xs:simpleContent>
<xs:extension base="xs:string">
<xs:attribute name="name" type="xs:string"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="AgeData">
<xs:simpleContent>
<xs:extension base="AgeType">
<xs:attribute name="name" type="xs:string"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="ZipData">
<xs:simpleContent>
<xs:extension base="ZipType">
<xs:attribute name="name" type="xs:string"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
<xs:complexType name="StateData">
<xs:simpleContent>
<xs:extension base="StateType">
<xs:attribute name="name" type="xs:string"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
The restrictions you declare in the types which are base for the simple types:
<xs:simpleType name="AgeType">
<xs:restriction base="xs:integer">
<xs:minExclusive value="20"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="StateType">
<xs:restriction base="xs:string">
<xs:pattern value="[A-Z]{2}"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="ZipType">
<xs:restriction base="xs:string">
<xs:pattern value="\d{5}"/>
</xs:restriction>
</xs:simpleType>
This will validate your file with the restrictions you require.