<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:xs="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://xmlobject/substgroup"
    xmlns:tns="http://xmlobject/substgroup">

    <xsd:complexType name="OrderItem">
        <xsd:sequence>
            <xsd:element ref="tns:item"/>
        </xsd:sequence>
    </xsd:complexType>



    <xsd:element name="item" type="tns:ItemType"/>
    <xsd:complexType name="ItemType">
        <xsd:sequence>
            <xsd:element name="sku" type="xsd:integer"/>
            <xsd:element name="name" type="xsd:string"/>
        </xsd:sequence>
    </xsd:complexType>

    <xsd:element name="beanBag" type="tns:BeanBagType"
        substitutionGroup="tns:item"/>
    <xsd:complexType name="BeanBagType">
        <xsd:complexContent>
            <xsd:extension base="tns:ItemType">
                <xsd:sequence>
                    <xsd:element name="size" type="tns:BeanBagSizeType"/>
                </xsd:sequence>
            </xsd:extension>
        </xsd:complexContent>
    </xsd:complexType>

    <xsd:element name="chair" substitutionGroup="tns:item"/>
    <xsd:element name="blockedchair" type="tns:ItemType" block="substitution"/>
    <xsd:element name="blockedItem" substitutionGroup="tns:blockedchair" />

    <xsd:element name="notachair" type="tns:ItemType"/>
    <xsd:element name="footstool" type="xsd:string"/>

    <xsd:complexType name="BeanBagSizeType">
        <xsd:simpleContent>
            <xsd:extension base="xsd:string">
                <xsd:attribute name="color" type="xsd:token"/>
            </xsd:extension>
        </xsd:simpleContent>
    </xsd:complexType>


    <xs:element name="string" type="xs:string"/>
    <xs:element name="stringSub" substitutionGroup="tns:string"/>
    <xs:complexType name="info">
        <xs:sequence>
            <xs:element ref="tns:string"/>
        </xs:sequence>
    </xs:complexType>
    <xs:element name="customer" type="tns:info"/>
    <xs:element name="employee" substitutionGroup="tns:customer"/>


    <xs:element name="blockedString" type="xs:string" block="substitution"/>
    <xs:element name="blockedStringSub" substitutionGroup="tns:blockedString"/>
    <xs:complexType name="blockedInfo">
        <xs:sequence>
            <xs:element ref="tns:blockedString"/>
        </xs:sequence>
    </xs:complexType>
    <xs:element name="blockedCustomer" type="tns:blockedInfo" block="substitution"/>
    <xs:element name="blockedEmployee" substitutionGroup="tns:blockedCustomer"/>

</xsd:schema>