clarity of example in Section 10.2

Hi, editor-team, 

When I am applying changes for Issue 37 to Section 10.2.,  I am
re-reading the example in that section. 

If my reading is correct, we don't have invoice-CS related information
in PurchaseOrderResponse, we may want to improve the clarity of the
example by adding the following to the BPEL sample code. 

----------------------

    <xsd:complexType name="PurchaseOrderResponse">

          <xsd:element name="CID" type="xsd:string"/>

          <xsd:element name="order" type="xsd:int"/>

              <xsd:element name="VID" type="xsd:string"/>
<!-- *adding* -->

              <xsd:element name="invNum" type="xsd:int"/> <!--
*adding* -->

        ...

    </xsd:complexType>

----------------------

---------------

<bpws:propertyAlias propertyName="cor:vendorID"

    messageType="tns:InvMessage" part="IVC">

    <query>

    /IVC/VID

    </query>

</bpws:propertyAlias>

<bpws:propertyAlias propertyName="cor:invoiceNumber"

    messageType="tns:InvMessage" part="IVC">

    <query>

    /IVC/InvNum

    </query>

</bpws:propertyAlias>

<!-- *adding* -->

<bpws:propertyAlias propertyName="cor:vendorID"

    messageType="tns:PurchaseOrderResponse" part="IVC">

    <query>

    ...

    </query>

</bpws:propertyAlias>

<!-- *adding* -->

<bpws:propertyAlias propertyName="cor:invoiceNumber"

    messageType="tns:PurchaseOrderResponse" part="IVC">

    <query>

    ... 

    </query>

</bpws:propertyAlias>

---------------

(BTW, we of course need to rectify the XPath used in the query
subelement after passing Issue 103)

It should either look like this:

<bpws:propertyAlias propertyName="cor:vendorID"

    messageType="tns:InvMessage" part="IVC">

    <query>/VID</query>

</bpws:propertyAlias>

or look like this: 

<bpws:propertyAlias propertyName="cor:vendorID"

    messageType="tns:InvMessage">

    <query>/IVC/VID</query>

</bpws:propertyAlias>

What do you guys think?

Regards,

Alex Yiu