Doubt in WSDL import element

[Divya Gehlot]

Hi,
Can any explain me the controversial statement
It's important to note that you
cannot use the XML schema import statement to import an XML schema directly from the
types element of some other WSDL document.(BP1.0)

<?xml version="1.0" encoding="UTF-8"?>
<definitions name="PurchaseOrderWS"
targetNamespace="http://www.Monson-Haefel.com/jwsbook/PO"
xmlns:mh="http://www.Monson-Haefel.com/jwsbook/PO"
xmlns:soapbind="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://schemas.xmlsoap.org/wsdl/">
<types>
<xsd:schema targetNamespace="http://www.Monson-Haefel.com/jwsbook/PO">
<!-- Import the PurchaseOrder XML schema document -->
<xsd:import namespace="http://www.Monson-Haefel.com/jwsbook/PO"
schemaLocation="http://www.Monson-Haefel.com/jwsbook/po.xsd" />
</xsd:schema>
</types>
<!-- message elements describe the input and output parameters -->
<message name="SubmitPurchaseOrderMessage">
<part name="order" element="mh :-P	 urchaseOrder" />
</message>
...
</definitions>

In RMH book at one point he said that we cant use import statement XML schema import statement to import an XML schema directly from the
types element of some other WSDL document but still he used.
Can any one explain why so?
or I am misunderstood with the statement.
Please help me.
Thanks in advance.

[Praveen Babu]

The Basic Profile says:

R2003 A DESCRIPTION MUST use the XML Schema "import" statement only within the xsd:schema element of the types section.

R2004 A DESCRIPTION MUST NOT use the XML Schema "import" statement to import a Schema from any document whose root element is not "schema" from the namespace "http://www.w3.org/2001/XMLSchema".

I am not sure why RMH has said it the other way.

[Divya Gehlot]

Hi,
It means the example in RMH is not correct.

[Peer Reynders]

The XML Schema <import> is used inside the XML Schema <schema> element which resides inside the WSDL <types> element.

The XML Schema <import> refers to a plain XML schema file po.xsd (p.41-75) - not a WSDL.

So the example is valid.

The quote (p.137) simply states that you cannot use the schema elements defined directly in one WSDL's <types> section in another WSDL through the use of an XML Schema import. If you need the schema in two WSDLs then the common schema needs to be factored out as a separate XML Schema file - then you can simply import (or "include" if they belong to your targetNamespace) the Schema into both of them.