About Accessing DataObjects using XPath

[grovecai]

Hi,guys

I have a DataObject as below and it's Type is defined in two schema with
different targetNamespace.
Now I want to access the "cost" property of the DataObject.The code is
like that:

    DataObject.get("deliord/cost");

It doesn't work. What's proper xpath expression I should use?
Please help. Thanks!

*DataObject:*

    <dat:deliverGoods xmlns:dat="http://dataact.act.org";
    xmlns:xsd="http://dataact.act.org/xsd";>
    <dat:deliord>
    <xsd:cost>100</xsd:cost>
    <xsd:id>101</xsd:id>
    <xsd:address>buaa nmb g513</xsd:address>
    <xsd:buyer>cai</xsd:buyer>
    <xsd:goodname>The WS Haters Handbook</xsd:goodname>
    </dat:deliord>
    </dat:deliverGoods>


*Schema_1:*

    <?xml version="1.0" encoding="UTF-8"?>
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
    xmlns:ax26="http://dataact.act.org/xsd";
    targetNamespace="http://dataact.act.org";>
    <xs:import namespace="http://dataact.act.org/xsd"; />
    <xs:element name="deliverGoods">
    <xs:complexType>
    <xs:sequence>
    <xs:element minOccurs="0" name="deliord" nillable="true"
    type="ax26:DeliverOrder" />
    </xs:sequence>
    </xs:complexType>
    </xs:element>
    </xs:schema>


*Schema_2:*

    <?xml version="1.0" encoding="UTF-8"?>
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";
    targetNamespace="http://dataact.act.org/xsd";>
    <xs:complexType name="DeliverOrder">
    <xs:sequence>
    <xs:element minOccurs="0" name="address" nillable="true"
    type="xs:string" />
    <xs:element minOccurs="0" name="buyer" nillable="true"
    type="xs:string" />
    <xs:element minOccurs="0" name="cost" type="xs:double" />
    <xs:element minOccurs="0" name="goodname" nillable="true"
    type="xs:string" />
    <xs:element minOccurs="0" name="id" type="xs:int" />
    </xs:sequence>
    </xs:complexType>
    </xs:schema>