• To: "'Eddie Robertsson'" <erobertsson@a...>,"'CHIUSANO, Joseph'" <JCHIUSANO@l...>
• Subject: RE: XML Schema - Enumerated List to Allow Blank Value
• From: "Michael Kay" <michael.h.kay@n...>
• Date: Wed, 7 Aug 2002 10:06:59 +0100
• Cc: <xml-dev@l...>
• Importance: Normal
• In-reply-to: <3D506B60.4090302@a...>
• Reply-to: <michael.h.kay@n...>

> ... However, you can easily to this by creating a union of 
> one enumerated xs:NMTOKEN type and one empty xs:string type. 
> Here is an 
> example:
> 
> <xs:simpleType name="myEnum">
>     <xs:union>
>         <xs:simpleType>
>             <xs:restriction base="xs:NMTOKEN">
>                 <xs:enumeration value="A"/>
>                 <xs:enumeration value="B"/>
>                 <xs:enumeration value="C"/>
>             </xs:restriction>
>         </xs:simpleType>
>         <xs:simpleType>
>             <xs:restriction base="xs:string">
>                 <xs:enumeration value=""/>
>             </xs:restriction>
>         </xs:simpleType>
>     </xs:union>
> </xs:simpleType>
> 
Why is this preferred to the more direct:

> <xs:simpleType name="myEnum">
>         <xs:simpleType>
>             <xs:restriction base="xs:string">
>                 <xs:enumeration value="A"/>
>                 <xs:enumeration value="B"/>
>                 <xs:enumeration value="C"/>
>                 <xs:enumeration value=""/>
>             </xs:restriction>
>         </xs:simpleType>
> </xs:simpleType>

?
Michael Kay
Software AG
home: Michael.H.Kay@n...
work: Michael.Kay@s... 

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