Extending unordered sequences/choices?

XML Programming

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April 21st, 2008, 05:36 AM

arewenotmen

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Extending unordered sequences/choices?

I'm trying to figure out extension and I've got a problem - I'm not sure whether it's my error, a failing of XML Schema, or a failure of the validator tool (http://tools.decisionsoft.com/schemaValidate/)

Basically I have:

Code:

<xs:complexType name="Row">
    <xs:sequence maxOccurs="unbounded">
        <xs:element name="row" type="Row" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element name="content" type="Content" minOccurs="0" maxOccurs="unbounded"/>
        <xs:element name="label" type="Label" minOccurs="0" maxOccurs="unbounded"/>
    </xs:sequence>
</xs:complexType>

so an unordered, unbounded set of row, content and labels.

Then I have:

Code:

<xs:complexType name="RepeatingRow">
    <xs:complexContent>
        <xs:extension base="Row">
            <xs:sequence maxOccurs="unbounded">
                <xs:element name="row-break" type="RowBreak" minOccurs="0" maxOccurs="unbounded"/>
            </xs:sequence>
        </xs:extension>
    </xs:complexContent>
</xs:complexType>

so an extension of row, but adding a new row-break element.

The trouble is that the aggregate list of RepeatingRow is now partially ordered, i.e. row-break has to go at the end.

Is there any neat way to solve this, without having to duplicate all the code from Row in RepeatingRow?

Thanks,

Rob

April 21st, 2008, 08:37 AM

jkmyoung

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Join Date: Sep 2004

Posts: 474

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You're trying more of a 'merge' into an existing complexType as opposed to an actual 'extension'. I'm leaning towards no, but I don't know all the schema tricks out there.

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