XPATH and Namespaces.

[RK]

Hi,

I'm calling a webservice that returns me data in a xml
node. However it has a specific namespace. I'm using the
xmlnamespacemanager, but the code does not work as
expected. Here is the code

oResponse.Data is the xmlnode returned by the webservice

Dim ns As System.Xml.XmlNamespaceManager = New
System.Xml.XmlNamespaceManager(New System.Xml.NameTable)
ns.AddNamespace("nm", oResponse.Data.NamespaceURI)
For Each oNode In oResponse.Data.SelectNodes
("/nm:Cg/nm:Cats/nm:Cat", ns)
Debug.WriteLine(oNode.Value)
Next

returns nothing

The xpath seems to be valid as the same works in
xselerator with the same prefix added to the namespaces in
the tool.

Also if I go to the debug pane and type
?ns.LookupPrefix(ns.NameTable.Get("nm"))
or
?ns.LookupPrefix("nm")
or
?ns.LookupNamespace(ns.NameTable.Get("nm"))
or
?ns.LookupNamespace("nm")
it only return 'nothing'.
I also tried the same by calling the addnamespace in debug
window with different prefix and uri with the same result.

I'm missing some crucial piece here, but can't place it.
Any help is appreciated.

TIA
RK.

[Oleg Tkachenko]

RK wrote:

I'm calling a webservice that returns me data in a xml
node. However it has a specific namespace. I'm using the
xmlnamespacemanager, but the code does not work as
expected. Here is the code

oResponse.Data is the xmlnode returned by the webservice

Dim ns As System.Xml.XmlNamespaceManager = New
System.Xml.XmlNamespaceManager(New System.Xml.NameTable)
ns.AddNamespace("nm", oResponse.Data.NamespaceURI)

This line looks suspicious to me. What kind of node oResponse.Data is?
In order to get NamespaceURI it must be either XmlElement or
XmlAttribute. For other types of nodes it's empty string, say if
oResponse.Data is XmlDocument. If so, try
oResponse.Data.DocumentElement.NamespaceURI
--
Oleg Tkachenko
XML Insider
http://www.tkachenko.com/blog

[RK]

Oleg, the class was created by the code generator when I
added a web reference. I'm not sure if its an element or
a document. However, I know that the URI has the correct
value as I can check that out in the watch window/debug
window.
-RK.

-----Original Message-----
RK wrote:

I'm calling a webservice that returns me data in a xml
node. However it has a specific namespace. I'm using the xmlnamespacemanager, but the code does not work as
expected. Here is the code

oResponse.Data is the xmlnode returned by the webservice

Dim ns As System.Xml.XmlNamespaceManager = New
System.Xml.XmlNamespaceManager(New System.Xml.NameTable)
ns.AddNamespace("nm", oResponse.Data.NamespaceURI)This line looks suspicious to me. What kind of node

oResponse.Data is?In order to get NamespaceURI it must be either XmlElement orXmlAttribute. For other types of nodes it's empty string, say ifoResponse.Data is XmlDocument. If so, try
oResponse.Data.DocumentElement.NamespaceURI
--
Oleg Tkachenko
XML Insider
http://www.tkachenko.com/blog

.

[Oleg Tkachenko]

RK wrote:

Oleg, the class was created by the code generator when I
added a web reference. I'm not sure if its an element or
a document.

Hmm, how can you select something being not sure what is input data?
Use oResponse.Data.WriteTo(new XmlTextWriter("dump.xml")) to show us the
data you are trying to query.
--
Oleg Tkachenko
XML Insider
http://www.tkachenko.com/blog

[RK]

Oleg,

I found that my XPath was not correct

/nm:Cg/nm:Cats/nm:Cat does not work
but
/nm:Cats/nm:Cat works.

Thanks.

-----Original Message-----
RK wrote:

Oleg, the class was created by the code generator when I added a web reference. I'm not sure if its an element or a document.Hmm, how can you select something being not sure what is

input data?Use oResponse.Data.WriteTo(new XmlTextWriter("dump.xml")) to show us thedata you are trying to query.
--
Oleg Tkachenko
XML Insider
http://www.tkachenko.com/blog

.