Chapter 13: Using schemas with XQuery

Example 13-1. Schema for catalog.xml

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="catalog" type="CatalogType"/>
  <xs:complexType name="CatalogType">
    <xs:sequence>
      <xs:element ref="product" maxOccurs="unbounded"/>
    </xs:sequence>
  </xs:complexType>
  <xs:element name="product" type="ProductType"/>
  <xs:complexType name="ProductType">
    <xs:sequence>
      <xs:element name="number" type="xs:integer"/>
      <xs:element name="name" type="NameType"/>
      <xs:element name="colorChoices" type="ColorListType" minOccurs="0"/>
      <xs:element name="desc" minOccurs="0"/>
    </xs:sequence>
    <xs:attribute name="dept" type="xs:string"/>
   </xs:complexType>
  <xs:simpleType name="ColorListType">
    <xs:list itemType="xs:string"/>
  </xs:simpleType>
  <xs:complexType name="NameType">
    <xs:simpleContent>
      <xs:extension base="xs:string">
        <xs:attribute name="language" type="LangType"/>
      </xs:extension>
    </xs:simpleContent>
  </xs:complexType>
  <xs:simpleType name="LangType">
    <xs:restriction base="xs:string">
      <xs:enumeration value="en"/>
      <xs:enumeration value="fr"/>
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

Example 13-2. Beginning of the catalog schema with target namespace

<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
           elementFormDefault="qualified"
           targetNamespace="http://datypic.com/prod"
           xmlns:prod="http://datypic.com/prod">
  <xs:element name="catalog" type="prod:CatalogType"/>
  <xs:complexType name="CatalogType">
    <!-- ... -->
  </xs:complexType>
</xs:schema>

Table 13-3. Examples of sequence types based on name and type

Example	Explanation
`schema-element (product)+`	One or more elements whose qualified name is `product`, that have been validated using a global element declaration in the ISSD
`schema-element (prod:product)`	One element whose qualified name is equal to `prod:product`, that has been validated using a global element declaration in the ISSD
`schema-attribute (prod:dept)`	One attribute whose qualified name is `prod:dept`, that has been validated using a global attribute declaration in the ISSD
`element(*, prod:ProductType)`	One element whose type annotation is `prod:ProductType` or a type derived from `prod:ProductType`
`element (prod:product, prod:ProductType)`	One element whose qualified name is equal to `prod:product`, whose type annotation is `prod:ProductType` or a type derived from `prod:ProductType`, that is in the ISSD