Chapter 2: A quick tour of XML Schema

Book examples

Example 2-1. Product instance

<product effDate="2001-04-02">
  <number>557</number>
  <size>10</size>
</product>

Example 2-2. Product schema

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <xsd:element name="product" type="ProductType"/>
  <xsd:complexType name="ProductType">
    <xsd:sequence>
      <xsd:element name="number" type="xsd:integer"/>
      <xsd:element name="size" type="SizeType"/>
    </xsd:sequence>
    <xsd:attribute name="effDate" type="xsd:date"/>
  </xsd:complexType>
  <xsd:simpleType name="SizeType">
    <xsd:restriction base="xsd:integer">
      <xsd:minInclusive value="2"/>
      <xsd:maxInclusive value="18"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>

Example 2-3. Elements with simple types

<size>10</size>
<comment>Runs large.</comment>
<availableSizes>10 large 2</availableSizes>

Example 2-4. Elements with complex types

<size system="US-DRESS">10</size>
<comment>Runs <b>large</b>.</comment>
<availableSizes><size>10</size><size>2</size></availableSizes>

Example 2-5. Attributes with simple types

<system="US-DRESS">availableSizes="10 large 2"

Example 2-6. Anonymous type

<xsd:element name="size">
  <xsd:simpleType>
    <xsd:restriction base="xsd:integer">
      <xsd:minInclusive value="2"/>
      <xsd:maxInclusive value="18"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:element>

Example 2-7. Elements with complex types

<size system="US-DRESS">10</size>
<product>
  <number>557</number>
  <size>10</size>
</product>
<letter>Dear <custName>Priscilla Walmsley</custName>...</letter>
<color value="blue"/>

Example 2-8. More complicated content model

<xsd:complexType name="ProductType">
  <xsd:sequence>
    <xsd:element name="number" type="xsd:integer"/>
    <xsd:choice minOccurs="0" maxOccurs="3">
      <xsd:element name="size" type="SizeType"/>
      <xsd:element name="color" type="ColorType"/>
    </xsd:choice>
    <xsd:any namespace="##other"/>
  </xsd:sequence>
  <xsd:attribute name="effDate" type="xsd:date"/>
</xsd:complexType>

Example 2-9. Complex type extension

<xsd:complexType name="ShirtType">
  <xsd:complexContent>
    <xsd:extension base="ProductType">
      <xsd:sequence>
        <xsd:element name="color" type="ColorType"/>
      </xsd:sequence>
      <xsd:attribute name="id" type="xsd:ID" use="required"/>
    </xsd:extension>
  </xsd:complexContent>
</xsd:complexType>

Example 2-10. Product schema document with target namespace

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            targetNamespace="http://example.org/prod"
            xmlns:prod="http://example.org/prod">
  <xsd:element name="product" type="prod:ProductType"/>
  <xsd:complexType name="ProductType">
    <xsd:sequence>
      <xsd:element name="number" type="xsd:integer"/>
      <xsd:element name="size" type="prod:SizeType"/>
    </xsd:sequence>
    <xsd:attribute name="effDate" type="xsd:date"/>
  </xsd:complexType>
  <xsd:simpleType name="SizeType">
    <xsd:restriction base="xsd:integer">
      <xsd:minInclusive value="2"/>
      <xsd:maxInclusive value="18"/>
    </xsd:restriction>
  </xsd:simpleType>
</xsd:schema>

Example 2-11. Instance with namespace

<prod:product xmlns:prod="http://example.org/prod"
              effDate="2001-04-02">
  <number>557</number>
  <size>10</size>
</prod:product>

Example 2-12. Schema composition using include and import

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns="http://example.org/ord"
            targetNamespace="http://example.org/ord">
  <xsd:include schemaLocation="moreOrderInfo.xsd"/>
  <xsd:import namespace="http://example.org/prod"
              schemaLocation="productInfo.xsd"/>
  <!--...-->
</xsd:schema>

Example 2-13. Using xsi:schemaLocation

<prod:product xmlns:prod="http://example.org/prod"
              xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
              xsi:schemaLocation="http://example.org/prod prod.xsd"
              effDate="2001-04-02">
  <number>557</number>
  <size>10</size>
</prod:product>

Example 2-14. Annotation

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
            xmlns:doc="http://example.org/doc">
  <xsd:element name="product" type="ProductType">
    <xsd:annotation>
      <xsd:documentation xml:lang="en"
        source="http://example.org/prod.html#product">
        <doc:description>These elements represent a product.
        </doc:description>
      </xsd:documentation>
    </xsd:annotation>
  </xsd:element>
</xsd:schema>