Navigating DOM with XPath in .NET

[scorpion74]

I have following xml file and I want to read <EquipmentClass> tag and it's Text.This xml file implements B2MML schema and hence xml file structure is not the usual one.Does anybody know how to ahieve the result?I tried using "SelectNodes" method but it doesn't work

<?xml version = "1.0" encoding = "UTF-8"?><EquipmentInformation xmlns = "http://www.wbf.org/xml/b2mml-v02" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://www.wbf.org/xml/b2mml-v02 file:B2MML-V02-Equipment.xsd"><ID>EquipmentInformation.BigCorp</ID><Description>The very first test load for Equipment Information</Description><Description>This will test multiple description lines</Description><Location><EquipmentID>BigCorp</EquipmentID><EquipmentElementLevel>Enterprise</EquipmentElementLevel></Location><PublishedDate>2004-02-01T03:49:00.000</PublishedDate><Equipment><ID>BigCorp</ID><Description>Represents the BigCorp Enterprise, a ficticious enterprise used as part of initial test data for the model</Description><Equipment><ID>HoustonTX</ID><Description>Big Corp Houston TX site</Description><Description>This site has Refining operations (big suprise!)</Description><Description>This is an example of a Continuous Manufacturing facility</Description><Equipment><ID>CrudeTankFarm</ID></Equipment><Equipment><ID>CrudeDistillationArea</ID><Location><EquipmentID>CrudeDistillationArea</EquipmentID><EquipmentElementLevel>Area</EquipmentElementLevel></Location></Equipment><Equipment><ID>SaturatedGasPlant</ID><Location><EquipmentID>SaturatedGasPlant</EquipmentID><EquipmentElementLevel>Area</EquipmentElementLevel></Location></Equipment><Equipment><ID>GasolineBlending</ID><Location><EquipmentID>GasolineBlending</EquipmentID><EquipmentElementLevel>Area</EquipmentElementLevel></Location></Equipment><EquipmentClassID>RefineryClass</EquipmentClassID><Location><EquipmentID>HoustonTx</EquipmentID><EquipmentElementLevel>Site</EquipmentElementLevel></Location></Equipment><Equipment><ID>DallasTX</ID><Description>Big Corp Dallas TX site</Description><Description>This site manufactures parts and assemblies for the Aerospace Industry</Description><Description>This is an example of a Discrete Manufacturing facility</Description><Location><EquipmentID>DallasTx</EquipmentID><EquipmentElementLevel>Site</EquipmentElementLevel></Location></Equipment></Equipment><EquipmentClass><ID>RefineryClass</ID><Description>Identifies Site type as being a refinery</Description><EquipmentClassProperty><ID>StringProp erty</ID><Description>This is a sample test property</Description><Description>This is not a real property</Description><Value><ValueString>Sample string value</ValueString><DataType>string</DataType><UnitOfMeasure>N/A</UnitOfMeasure><Any/></Value></EquipmentClassProperty><EquipmentClassProperty><ID >MultiValueStringProperty</ID><Value><ValueString>String 1</ValueString><DataType>string</DataType><UnitOfMeasure>N/A</UnitOfMeasure><Any/></Value><Value><ValueString>String 2</ValueString><DataType>string</DataType><UnitOfMeasure>N/A</UnitOfMeasure><Any/></Value><Value><ValueString>String 3</ValueString><DataType>string</DataType><UnitOfMeasure>N/A</UnitOfMeasure><Any/></Value></EquipmentClassProperty><EquipmentClassProperty><ID >NumericProperty</ID><Value><ValueString>200</ValueString><DataType>double</DataType><UnitOfMeasure>Mbbl/month</UnitOfMeasure><Any/></Value></EquipmentClassProperty></EquipmentClass></EquipmentInformation>

[Derek Harmon]

"scorpion74" <an*******@discussions.microsoft.com> wrote in message news:9A**********************************@microsof t.com...

I have following xml file and I want to read <EquipmentClass> tag and it's Text.
This xml file implements B2MML schema and hence xml file structure is not the
usual one.
What's unusual about it?
Does anybody know how to ahieve the result?I tried using "SelectNodes"
method but it doesn't work.

How did you specify the namespace URI, http://www.wbf.org/xml/b2mml-v02,
in the XPath expression when you called SelectNodes( )?

This is the likely culprit, at least it's the most frequently asked about.

XmlNamespaceManager nsMan = new XmlNamespaceManager( xmlDoc.NameTable);
nsMan.AddNamespace( "ns1", "http://www.wbf.org/xml/b2mml-v02");
XmlNodeList results = xmlDoc.SelectNodes( "//ns1:EquipmentClass/ns1:ID", nsMan);
if ( null != results )
foreach ( XmlNode n in results )
Console.WriteLine( n.InnerText);

Since you can't specify a prefix for the default namespace in the XPath
expression, it needs a prefix associated with that default namespace URI
just for purposes of writing the expression. In order to evaluate the ex-
pression, it needs a reference to a Namespace Manager supplied to
the SelectNodes( ), which has an overload accepting XmlNamespace-
Manager.
Derek Harmon