Learn XML (II) --XSD

XML Schema Definitions

• <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
      xmlns:dw="http://www.ibm.com/developerWorks/"
      elementFormDefault="unqualified"
      attributeFormDefault="unqualified" version="4.0">
  

Elements and attributes

• element, annotation, complexType, choice, type

Simple types

• <xsd:element name="text-data" type="xsd:string" />

Extending base types

• restrictionn
  <xsd:simpleType name="colorname">
    <xsd:restriction base="xsd:string">
      <xsd:enumeration value="blue" />
      <xsd:enumeration value="green" />
      <xsd:enumeration value="red" />
    </xsd:restriction>
  </xsd:simpleType>
• extentioin
  <xsd:element name="title">
    <xsd:complexType>
      <xsd:simpleContent>
        <xsd:extension base=" xsd:string">
          <xsd:attribute name="isbn" type="xsd:string"/>
        </xsd:extension>
      </xsd:simpleContent>
    </xsd:complexType>
  </xsd:element>

Generating XML Schemas from Instance Documents

• relaxer -xsd toc.xml

Generating XML Schemas from a DTD

• install dtd2xs from [url]www.lumrix.net[/url]
• setup CLASSPAHT
• java dtd2xsd toc.dtd > toc-schema.xsd

Validating XML Against an XML Schema

• nonnamespaced
  <dw-document xsi:noNamespaceSchemaLocation="dw-document-4.0.xsd"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
• namespaced
  <dw-document xmlns="http://www.ibm.com/developerWorks"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.ibm.com/developerWorks
                        dw-document-4.0.xsd">
• Validating against a schema
  xmllint --schema dw-document-4.0.xsd index.xml --noout