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xmlxsd
Javier Ochoa
Javier Ochoa

Reputation: 127

how to extend attributes using XML Schema?

I have on the XML:

<Devices>
    <Device name="Phone" number="123456789"/>
    <Device name="Computer" ip="192.168.0.1"/>
</Devices>

and I want to set an Schema for this, where I have 'devices' and I can declare a device, but if the device has the name="phone" a number has to be declared as required, but if the device is name="computer", well, the ip is required just for 'computer'

is there a way to do this, is it possible?

Upvotes: 4

Views: 2918

Answers (1)

Mike Barlotta
Mike Barlotta

Reputation: 725

This would be the XML schema

<xs:schema elementFormDefault="qualified" version="1.0"
    targetNamespace="stackoverflow" xmlns:tns="stackoverflow"
    xmlns:xs="http://www.w3.org/2001/XMLSchema">

    <xs:element name="Devices" type="tns:deviceListType" />

    <xs:complexType name="deviceListType">
        <xs:sequence>
            <xs:element name="Device" type="tns:deviceType" maxOccurs="unbounded" />
        </xs:sequence>
    </xs:complexType>

    <xs:complexType name="deviceType">

    </xs:complexType>

    <xs:complexType name="computerType">
        <xs:complexContent>
            <xs:extension base="tns:deviceType">
                <xs:attribute name="name">
                    <xs:simpleType>
                        <xs:restriction base="xs:string">
                            <xs:enumeration value="Computer" />
                        </xs:restriction>
                    </xs:simpleType>
                </xs:attribute>
                <xs:attribute name="ip" />
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>

    <xs:complexType name="phoneType">
        <xs:complexContent>
            <xs:extension base="tns:deviceType">
                <xs:attribute name="name">
                    <xs:simpleType>
                        <xs:restriction base="xs:string">
                            <xs:enumeration value="Phone" />
                        </xs:restriction>
                    </xs:simpleType>
                </xs:attribute>
                <xs:attribute name="number" />
            </xs:extension>
        </xs:complexContent>
    </xs:complexType>
</xs:schema>

And this would be a sample XML document

<sf:Devices xmlns:sf="stackoverflow"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation="stackoverflow test.xsd">
    <sf:Device xsi:type="sf:computerType" name="Computer" ip="1"/>
    <sf:Device xsi:type="sf:phoneType" name="Phone" number="2"/>
</sf:Devices>

Sorry if the original XSD sample was confusing.

Upvotes: 3

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