问题
I am in need of a case insensitive string enumeration type in my XML schema (.xsd) file. I can get case insensitive by doing the following.
<xs:simpleType name="setDigitalPointType">
<xs:restriction base="xs:string">
<xs:pattern value="[Oo][Nn]" />
<xs:pattern value="[Oo][Ff][Ff]" />
</xs:restriction>
</xs:simpleType>
The only problem is that I get no enumeration values. I will not get the nice intellesense when using Visual Studio to write my XML. The following will give me enumerations but it is case sensitive.
<xs:simpleType name="setDigitalPointType">
<xs:restriction base="xs:string">
<xs:enumeration value="on" />
<xs:enumeration value="off" />
</xs:restriction>
</xs:simpleType>
This will give me my enumerations but if I ever receive a value of "On", "ON", or "oN" it will fail verification.
I want enumeration of "on", "off" and allow entry of case insensitive versions.
回答1:
IBM developerWorks has an article on how to use XSLT to perform the construction of the full set of enumeration alternatives in an automated fashion. It is presented as a workaround to the lack of case-insensitive enumerations.
回答2:
If you want to both keep the case-insensitive validation, while still getting Intellisense in Visual Studio 2010, you can use a union:
<xs:simpleType name="setDigitalPointType">
<xs:union>
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:enumeration value="on" />
<xs:enumeration value="off" />
</xs:restriction>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:string">
<xs:pattern value="[Oo][Nn]" />
<xs:pattern value="[Oo][Ff][Ff]" />
</xs:restriction>
</xs:simpleType>
</xs:union>
</xs:simpleType>
This works because it exploits the fact that Visual Studio 2010 only processes the first simple type in a union when it builds it's Intellisense data. However when it validates a document, it processes both, which means "On" is still determined to be valid even though it isn't in the list of enumeration values.
回答3:
Well, you could just list all the permutations as patterns :)
来源:https://stackoverflow.com/questions/359359/xml-schema-case-insensitive-enumeration-of-simple-type-string