Sample schema

po.xsd

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
	<xsd:annotation>
		<xsd:documentation xml:lang="en">
     Purchase order schema for Example.com.
     Copyright 2000 Example.com. All rights reserved.
    </xsd:documentation>
	</xsd:annotation>
	<xsd:element name="comment" type="xsd:string">
		<xsd:annotation>
			<xsd:documentation>doc for comment</xsd:documentation>
		</xsd:annotation>
	</xsd:element>
	<xsd:complexType name="USAddress">
		<xsd:annotation>
			<xsd:documentation>doc for USAddress</xsd:documentation>
		</xsd:annotation>
		<xsd:sequence>
			<xsd:element name="name" type="xsd:string"/>
			<xsd:element name="street" type="xsd:string"/>
			<xsd:element name="city" type="xsd:string"/>
			<xsd:element name="state" type="xsd:string"/>
			<xsd:element name="zip" type="xsd:decimal"/>
		</xsd:sequence>
		<xsd:attribute name="country" type="xsd:NMTOKEN" fixed="US"/>
	</xsd:complexType>
	<!-- Stock Keeping Unit, a code for identifying products -->
	<xsd:simpleType name="SKU">
		<xsd:annotation>
			<xsd:documentation>doc for SKU</xsd:documentation>
		</xsd:annotation>
		<xsd:restriction base="xsd:string">
			<xsd:pattern value="\d{3}-[A-Z]{2}"/>
		</xsd:restriction>
	</xsd:simpleType>
</xsd:schema>