<?xml version=“1.0” encoding=“utf-8”?> <xs:schema

  attributeFormDefault="unqualified"
  elementFormDefault="qualified"
  xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:include schemaLocation="types.xsd" />
<xs:simpleType name="id">
  <xs:restriction base="xs:token">
    <xs:pattern value="[a-zA-Z0-9/_-]{1,40}" />
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="gtin">
  <xs:restriction base="xs:token">
    <xs:pattern value="[0-9]{8}|[0-9]{12,14}" />
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="mpn">
  <xs:restriction base="xs:token">
    <xs:minLength value="1" />
    <xs:maxLength value="50" />
  </xs:restriction>
</xs:simpleType>
<xs:simpleType name="sku">
  <xs:restriction base="xs:token">
    <xs:minLength value="1" />
    <xs:maxLength value="50" />
  </xs:restriction>
</xs:simpleType>
<xs:complexType name="identity">
  <xs:sequence>
    <xs:element minOccurs="1" maxOccurs="1" name="id" type="id" />
    <xs:element minOccurs="0" maxOccurs="1" name="gtin" type="gtin" />
    <xs:element minOccurs="0" maxOccurs="1" name="mpn" type="mpn" />
    <xs:element minOccurs="0" maxOccurs="1" name="sku" type="sku" />
  </xs:sequence>
</xs:complexType>

</xs:schema>