It looks like your selectSingleNode() call is using an absolute path, that
is, it references xs:element starting at the top level, xs:schema.

Is there a way to find the xs:sequence element relative to the current node?

Thanks for our help.

C.

I'm using msxml 3 and up, btw.

> I'm not sure what version of MSXML component are you using , I've done a
> simple test via MSXML3, we can still use XPATH from the give node to
select
> a certain child node under it. Here is the code of My test app:
>
> ===========main cpp file===========================
> #include "stdafx.h"
> #include <stdio.h>
> #import <msxml3.dll>
> using namespace MSXML2;
>
>
>
> int main(int argc, char* argv[])
> {
> IXMLDOMDocumentPtr pXMLDom;
>    HRESULT hr;
>
>
>
>    CoInitialize(NULL);
>
>    hr = pXMLDom.CreateInstance(__uuidof(DOMDocument30));
>    if (FAILED(hr))
>    {
>       printf("Failed to instantiate DOMDocument40 class\n");
>       return -1;
>    }
>
>
>
>    pXMLDom->async = VARIANT_FALSE;
>    if ( pXMLDom->load("schema.xml") != VARIANT_TRUE)
>    {
>       printf("Failed load xml data from file.\n%s\n",
>          (LPCSTR)pXMLDom->parseError->Getreason());
>       return -1;
>    }
>
>     IXMLDOMNodePtr pNode =
>
pXMLDom->selectSingleNode("//xs:schema/xs:element/xs:complexType/xs:choice/x
> s:element");
>    pXMLDom->selectSingleNode(
>    IXMLDOMNodePtr pSubNode = NULL;
>    if (pNode == NULL)
>    {
>       printf("Invalid node fetched.\n%s\n",
>          (LPCSTR)pXMLDom->parseError->Getreason());
>    }
>    else
>    {
>       printf("Result from selectSingleNode:\nNode, <%s>:\n\t%s\n\n",
>          (LPCSTR)pNode->nodeName, (LPCSTR)pNode->xml);
>
>   pSubNode =
> pNode->selectSingleNode("//xs:element/xs:complexType/xs:sequence");
>
>   if (pSubNode == NULL)
>   {
> printf("Invalid node fetched.\n%s\n",
> (LPCSTR)pXMLDom->parseError->Getreason());
>   }
>       else
>   {
> printf("Result from selectSingleNode:\nNode, <%s>:\n\t%s\n\n",
> (LPCSTR)pSubNode->nodeName, (LPCSTR)pNode->xml);
>
>   }
>
>    }
>
>    pXMLDom.Release();
>    pNode.Release();
>    pSubNode.Release();
>    CoUninitialize();
>
>    getchar();
>    return 0;
>
> }
>
> ============test schema file==================
> <?xml version="1.0" ?>
> <xs:schema id="Dataset1" targetNamespace="http://tempuri.org/Dataset1.xsd"
> xmlns:mstns="http://tempuri.org/Dataset1.xsd"
> xmlns="http://tempuri.org/Dataset1.xsd"
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xmlns:msdata="urn:schemas-microsoft-com:xml-msdata"
> attributeFormDefault="qualified" elementFormDefault="qualified">
>   <xs:element name="Dataset1" msdata:IsDataSet="true">
>     <xs:complexType>
>       <xs:choice maxOccurs="unbounded">
>         <xs:element name="venue_seats">
>           <xs:complexType>
>             <xs:sequence>
>               <xs:element name="venue_id" msdata:ReadOnly="true"
> msdata:AutoIncrement="true" type="xs:int" />
>               <xs:element name="seat_id" type="xs:int" minOccurs="0" />
>               <xs:element name="a" type="xs:string" minOccurs="0" />
>               <xs:element name="Table1" minOccurs="0"
maxOccurs="unbounded">
>                 <xs:complexType>
>                   <xs:sequence>
>                     <xs:element name="id" msdata:ReadOnly="true"
> msdata:AutoIncrement="true" type="xs:int" />
>                     <xs:element name="a" type="xs:string" minOccurs="0" />
>                     <xs:element name="b" type="xs:string" minOccurs="0" />
>                   </xs:sequence>
>                 </xs:complexType>
>               </xs:element>
>             </xs:sequence>
>           </xs:complexType>
>         </xs:element>
>       </xs:choice>
>     </xs:complexType>
>     <xs:unique name="Dataset1Key2" msdata:PrimaryKey="true">
>       <xs:selector xpath=".//mstns:Table1" />
>       <xs:field xpath="mstns:id" />
>     </xs:unique>
>     <xs:unique name="Dataset1Key1" msdata:PrimaryKey="true">
>       <xs:selector xpath=".//mstns:venue_seats" />
>       <xs:field xpath="mstns:venue_id" />
>     </xs:unique>
>     <xs:keyref name="Table1venue_seats" refer="Dataset1Key2">
>       <xs:selector xpath=".//mstns:venue_seats" />
>       <xs:field xpath="mstns:seat_id" />
>     </xs:keyref>
>     <xs:keyref name="venue_seatsTable1" refer="Dataset1Key1"
> msdata:IsNested="true">
>       <xs:selector xpath=".//mstns:Table1" />
>       <xs:field xpath="mstns:id" />
>     </xs:keyref>
>   </xs:element>
> </xs:schema>
> ============================================
>
> Please have a try to see whether it helps. Thanks.
>
> Regards,
>
> Steven Cheng
> Microsoft Online Support
>
> Get Secure! www.microsoft.com/security
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