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File: Schema.xsd
<?xml version = "1.0" ?>
<xs:schema xmlns:xs = "http://www.w3.org/2001/XMLSchema">
<xs:element name="Book">
<xs:complexType>
<xs:sequence minOccurs = "0" maxOccurs = "1">
<xs:element name="Title" type="xs:string" />
<xs:element name="Author" type="xs:string" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
So the following two examples would be allowed:
<Book></Book>
<Book>
<Title>XML</Title>
<Author>author</Author>
</Book>
But the third is invalid because it only contains one of the child elements:
<Book>
<Title>Professional XML Schema</Title>
</Book>
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