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Re: [xml-dev] Best practice for XSD enumeration values?

From: Mukul Gandhi <>
To: Kurt Cagle <>
Date: 2022-02-17T11:30:06Z
ID: <CANGHzgB4BxKEXbu9wJ7EF5a=XgWOG3Xin5_QX02-7NJCrAN=>
Thread: Re: [xml-dev] Best practice for XSD enumeration values?

Hi Kurt,

On Thu, Feb 17, 2022 at 11:09 AM Kurt Cagle <[email protected]> wrote:

If you had to do this as an enumeration, I'd use the following:

<xsd:schema elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="airportType">
        <xsd:simpleType>
            <xsd:list>
                <xsd:simpleType>
                    <xsd:restriction base="xsd:string">
                        <xsd:enumeration value="civil"/>
                        <xsd:enumeration value="military"/>
                        <xsd:enumeration value="active"/>
                        <xsd:enumeration value="inactive"/>
                        <xsd:enumeration value="permanent"/>
                        <xsd:enumeration value="temporary"/>
                    </xsd:restriction>                  
                </xsd:simpleType>               
            </xsd:list>
        </xsd:simpleType>
    </xsd:element>
</xsd:schema>

Then you would have:

<airportType>active civil permanent</airportType>

Nice thought.

The schema you've posted, would allow the XML element <airportType>active active civil permanent</airportType> to be reported as valid (i.e, duplicate strings are permitted).

It seems that, a modification like following (with XSD 1.1 needed) could fix that,

<xsd:schema elementFormDefault="qualified" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<xsd:element name="airportType">
<xsd:simpleType>
<xsd:restriction base="AirportType">
<xsd:assertion test="count($value) = count(distinct-values($value))"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>

<xsd:simpleType name="AirportType">
<xsd:list>
<xsd:simpleType>
<xsd:restriction base="xsd:string">
<xsd:enumeration value="civil"/>
<xsd:enumeration value="military"/>
<xsd:enumeration value="active"/>
<xsd:enumeration value="inactive"/>
<xsd:enumeration value="permanent"/>
<xsd:enumeration value="temporary"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:list>
</xsd:simpleType>

</xsd:schema>

Regards,

Mukul Gandhi

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