Designing Your own XML Schema: Restrictions and User Defined Types - User-defined Complex Type in XML Schema
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In the previous sections, we dealt only with simple user-defined types. Now, we shall deal with the user-defined complex type.
Let us consider that I would like to define my own data type called “AddressType,” which holds Street, City and Zip elements. After defining “AddressType,” I would like to use it with two elements, “ResAddress” (residential address) and “OffAddress” (Office Address) as part of the “Employee” definition. The following listing of a complete XML Schema does the same:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault=
"unqualified">
<xs:element name="Employees">
<xs:annotation>
<xs:documentation>Contains All Employee information</xs:documentation>
</xs:annotation>
<xs:complexType>
<xs:sequence>
<xs:element name="Employee" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="ID" type="xs:string">
</xs:element>
<xs:element name="Name" type="xs:string" />
<xs:element name="ResAddress" type="AddressType" />
<xs:element name="OffAddress" type="AddressType" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:key name="PK_Employee_ID">
<xs:selector xpath=".//Employee" />
<xs:field xpath="ID" />
</xs:key>
</xs:element>
<xs:complexType name="AddressType">
<xs:sequence>
<xs:element name="Street" type="xs:string" />
<xs:element name="City" type="xs:string" />
<xs:element name="zip" type="xs:string" />
</xs:sequence>
</xs:complexType>
</xs:schema>
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