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Three equivalent ways to specify an unconstrained data type ... are there others?

From: Costello, Roger L. <costello@mitre.org>
Date: Sat, 20 Oct 2012 12:04:19 +0000
To: "xmlschema-dev@w3.org" <xmlschema-dev@w3.org>
Message-ID: <B5FEE00B53CF054AA8439027E8FE17751E68C507@IMCMBX04.MITRE.ORG>
Hi Folks,

Below are declarations of three elements, E1, E2, and E3. All three elements have the same data type: an unconstrained string. All other data types (boolean, integer, etc.) can be similarly specified. Thus there are 3 ways to specify the same thing for every built-in data type.

Can you think of any other ways to specify an unconstrained data type?

    <xs:element name="E1" type="xs:string" />  
    
    <xs:element name="E2" type="string-equivalent-1" /> 
    
    <xs:element name="E3" type="string-equivalent-2" />
    
    <xs:complexType name="string-equivalent-1">
        <xs:simpleContent>
            <xs:extension base="xs:string" />
        </xs:simpleContent>
    </xs:complexType>
    
    <xs:simpleType name="string-equivalent-2">
        <xs:restriction base="xs:string" />
    </xs:simpleType>

/Roger
    
Received on Saturday, 20 October 2012 12:04:46 UTC

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