Designing Your own XML Schema: Learn the Essentials - XML Schema: a more practical example
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I shall conclude this article with one more practical “complex” example. Let us have a look at the following XML schema now:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" elementFormDefault="qualified" attributeFormDefault="unqualified">
<xs:element name="EmployeeDetails">
<xs:annotation>
<xs:documentation>Comment describing your root element</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 name="Name" type="xs:string"/>
<xs:element name="Address" maxOccurs="3">
<xs:complexType>
<xs:sequence>
<xs:element name="Street" type="xs:string"/>
<xs:element name="City" type="xs:string"/>
<xs:element name="State" type="xs:string"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
According to the above example, the document root element would be “EmployeeDetails.” The element “EmployeeDetails” internally can contain “Employee” elements. The element “Employee” internally contains three more elements: “ID,” “Name” and “Address.” “Address” is again a complex type and internally contains the elements “Street,” “City” and “State”.
You should observe that there could be any number of “Employee” elements within “EmployeeDetails.” And finally you can have a maximum of three “Address” elements for each “Employee.”
You should also observe that “ID,” “Name,” “Street,” “City” and “State” are defined with “simple types” rather than with “complex types.” The only complex elements are “EmployeeDetails,” “Employee” and “Address.”
Now, how would the XML document look when it conformed to the above XML Schema? The following would be a sample XML document which conforms to the XML Schema above.
<?xml version="1.0" encoding="UTF-8"?>
<EmployeeDetails xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="C:\EmployeeDetails.xsd">
<Employee>
<ID>1001</ID>
<Name>Jag</Name>
<Address>
<Street>13-20-26, Gunupudi</Street>
<City>Bhimavaram</City>
<State>Andhra Pradesh</State>
</Address>
<Address>
<Street>Nallam vari thota</Street>
<City>BVRM</City>
<State>AP, India</State>
</Address>
</Employee>
<Employee>
<ID>1002</ID>
<Name>Winner</Name>
<Address>
<Street>11-11-11, </Street>
<City>Bhimavaram</City>
<State>Andhra Pradesh</State>
</Address>
</Employee>
</EmployeeDetails>
Any comments, suggestions, feedback, bugs, errors are highly appreciated at jag_chat@yahoo.com
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