Create Schema For Purchase Order in XML

<?xml version="1.0" encoding="iso-8859-1"?>

<xs:schema xmlns:xs="   ">

<xs:element name="shiporder">

  <xs:complexType>

    <xs:sequence>

      <xs:element name="orderperson" type="xs:string"/>

      <xs:element name="shipto">

        <xs:complexType>

          <xs:sequence>

            <xs:element name="name" type="xs:string"/>

            <xs:element name="address" type="xs:string"/>

                                     <xs:element name="city" type="xs:string"/>

            <xs:element name="country" type="xs:string"/>

          </xs:sequence>

        </xs:complexType>

      </xs:element>

                                    <xs:element name="email" type="xs:email"/>

                                                <xs:sequence>

                                                             <xs:element name="to" type="xs:string"/>

                                                                        <xs:simpleType>

                                                                                     <xs:restriction base="xs:string">

                                                                                     <xs:pattern value="{[a-zA-Z0-9]}+[@]{[a-zA-Z]}+[.][com|in|org]">

                                                                         </xs:pattern>

                                                             </xs:restriction>

                                                 </xs:simpleType>

                                     </xs:sequence>

                                     

          

      <xs:element name="item" maxOccurs="unbounded">

        <xs:complexType>

          <xs:sequence>

            <xs:element name="title" type="xs:string"/>

            <xs:element name="note" type="xs:string" minOccurs="0"/>

            <xs:element name="quantity" type="xs:positiveInteger"/>

            <xs:element name="price" type="xs:decimal"/>

          </xs:sequence>

        </xs:complexType>

      </xs:element>

    </xs:sequence>

    <xs:attribute name="orderid" type="xs:string" use="required"/>

  </xs:complexType>

</xs:element>

</xs:schema>