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XML Schema

W3C approved
not totally supported by libxml2
very complex and powerfull

books.xsd:


<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <xs:import namespace="http://purl.org/dc/elements/1.1/" schemaLocation="dc.xsd"/>
  <xs:element name="books">
    <xs:complexType>
      <xs:sequence>
        <xs:element maxOccurs="unbounded" ref="book"/>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
  <xs:element name="book">
    <xs:complexType>
      <xs:sequence>
        <xs:element ref="title"/>
        <xs:element ref="year"/>
        <xs:element ref="dc:subject"/>
      </xs:sequence>
      <xs:attribute name="id" use="required" type="xs:integer"/>
      <xs:attribute name="isbn" use="required" type="xs:NMTOKEN"/>
    </xs:complexType>
  </xs:element>
  <xs:element name="title" type="xs:string"/>
  <xs:element name="year" type="xs:integer"/>
</xs:schema>

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