SelectSingleNode with namespaces

[Robert Ludig]

My question is somewhat related to the previous question in this
newsgroup:

http://groups.google.de/group/micros...58771b3b60cd47

I am having trouble unerstanding how to use XmlNode.SelectSingleNode
Method (String, XmlNamespaceManager) node when an xmlns Atrribute is
present. this is my xml file:

<?xml version="1.0" encoding="utf-8" ?>
<configuration xmlns="http://company.de/VCT9/Core/Configuration"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://company.de/VCT9/Core/Configuration
config.xsd">
<logging>
<listeners>
<listener
name="myXMLListener"
outputFormat="XML"
targetType="File"
targetFileName="%source%_dd-MM-yy.log"
targeFileMaxSize=""
filterSources="AIS.*|SomeTarget"
filterEventTypes="All" />
<listener
name="myCSVListener"
outputFormat="CSV"
outputOptions="Callstack ThreadId"
targetFileName="dd-MM-yyyy.csv" />
</listeners>
</logging>
</configuration>

Now I am selecting the <listenersnode like this:

XmlDocument configurationDocument = new XmlDocument();
configurationDocument.Load(configFile);
XmlNamespaceManager manager = new
XmlNamespaceManager(configurationDocument.NameTabl e);
manager.AddNamespace("config",
"http://company.de/VCT9/Core/Configuration");
XmlNode listenersNode
= configurationDocument.SelectSingleNode
("//config:listeners",manager);

This works fine. There is only one problem, I seem to be forced to
hardcode the namespace:

manager.AddNamespace("config",
"http://company.de/VCT9/Core/Configuration");

I do not know the urn for the namespace
("http://company.de/VCT9/Core/Configuration") of the root node
<configurationat compiletime. It might change. How can I select the
<listenersnode without knowing the namespaceurn at compiletime.

While we are at it. Maybe it is possible to connect a xml-schema with a
xml file without having to specify a namespace
(xmlns="http://company.de/VCTC3/Core/Configuration") at all? If is how?

[Oleg Tkachenko [MVP]]

Robert Ludig wrote:

I do not know the urn for the namespace
("http://company.de/VCT9/Core/Configuration") of the root node
<configurationat compiletime. It might change. How can I select the
<listenersnode without knowing the namespaceurn at compiletime.

//*[local-name()='listeners']

While we are at it. Maybe it is possible to connect a xml-schema with a
xml file without having to specify a namespace
(xmlns="http://company.de/VCTC3/Core/Configuration") at all? If is how?

You can do it programmatically. But that's weird. Namespace is usually
stable thing, why do you change it?

--
Oleg Tkachenko [XML MVP, MCPD]
http://blog.tkachenko.com | http://www.XmlLab.Net | http://www.XLinq.Net

[Martin Honnen]

Robert Ludig wrote:

<configuration xmlns="http://company.de/VCT9/Core/Configuration"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

XmlDocument configurationDocument = new XmlDocument();
configurationDocument.Load(configFile);
XmlNamespaceManager manager = new
XmlNamespaceManager(configurationDocument.NameTabl e);
manager.AddNamespace("config",
"http://company.de/VCT9/Core/Configuration");
XmlNode listenersNode
= configurationDocument.SelectSingleNode
("//config:listeners",manager);

This works fine. There is only one problem, I seem to be forced to
hardcode the namespace:

manager.AddNamespace("config",
"http://company.de/VCT9/Core/Configuration");

Assuming the namespace is declared on the root element (document
element) as a default namespace (xmlns="URL") then you can simply do e.g.
manager.AddNamespace("config",
configurationDocument.DocumentElement.NamespaceURI );

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Robert Ludig]

Assuming the namespace is declared on the root element ...

The assumtion I can make about the XML-Document, I have to parse is as
followed:

the namespace is either declared in the root element or no namespace
is declared at all (and no xsd is referenced).

What would be the correct approach in this case ?

Martin Honnen schrieb:

Robert Ludig wrote:

<configuration xmlns="http://company.de/VCT9/Core/Configuration"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

XmlDocument configurationDocument = new XmlDocument();
configurationDocument.Load(configFile);
XmlNamespaceManager manager = new
XmlNamespaceManager(configurationDocument.NameTabl e);
manager.AddNamespace("config",
"http://company.de/VCT9/Core/Configuration");
XmlNode listenersNode
= configurationDocument.SelectSingleNode
("//config:listeners",manager);

This works fine. There is only one problem, I seem to be forced to
hardcode the namespace:

manager.AddNamespace("config",
"http://company.de/VCT9/Core/Configuration");

Assuming the namespace is declared on the root element (document
element) as a default namespace (xmlns="URL") then you can simply do e.g.
manager.AddNamespace("config",
configurationDocument.DocumentElement.NamespaceURI );

--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/

[Martin Honnen]

Robert Ludig wrote:

The assumtion I can make about the XML-Document, I have to parse is as
followed:

the namespace is either declared in the root element or no namespace
is declared at all (and no xsd is referenced).

What would be the correct approach in this case ?

Then you could check
if (yourDoc.DocumentElement.NamespaceURI == "") {
// use XPath expressions without a prefix and without a
// namespace manager here
}
else {
// set up namespace manager and prefix as
// already described and use that
}
--

Martin Honnen --- MVP XML
http://JavaScript.FAQTs.com/