In ISO/IEC 19757-2 RELAX-NG Compact Syntax:
element altitude { attribute units { 'feet' | 'meters' }, text }
At 2016-05-02 11:49 +0000, Costello, Roger L. wrote:
>Compare DTDs and XSDs for this simple example:
>
> An element, altitude, with an attribute,
> units whose value is restricted to feet
> or meters:
>
>
>Altitude.dtd
>--------------------------------------------------------
><!ELEMENT altitude (#PCDATA)>
>
><!ATTLIST altitude
> units (feet|meters) #REQUIRED>
>--------------------------------------------------------
>
>
>Altitude.xsd
>--------------------------------------------------------
><?xml version="1.0" encoding="UTF-8"?>
><xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
> elementFormDefault="qualified"
> attributeFormDefault="unqualified">
>
> <xs:element name="altitude">
> <xs:complexType>
> <xs:simpleContent>
> <xs:extension base="xs:string">
> <xs:attribute name="units"
> use="required">
> <xs:simpleType>
>
><xs:restriction base="xs:string">
>
><xs:enumeration value="feet" />
>
><xs:enumeration value="meters" />
> </xs:restriction>
> </xs:simpleType>
> </xs:attribute>
> </xs:extension>
> </xs:simpleContent>
> </xs:complexType>
> </xs:element>
>
></xs:schema>
>--------------------------------------------------------
>
>DTD: 3 lines
>XSD: 21 lines
>
>DTD: easy to understand
>XSD: impossible to understand without deep knowledge of XSDs
>
>DTD: simple problem, simple solution
>XSD: simple problem, difficult solution
>
>/Roger
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