How to retrieve data from XML file after Schema validation?

Question

In my XML file it has this line with the top element. xmlns=http://tempuri.org/XMLSchema.xsd. I think this line it is used to conform with schema Because I specified ValidationType in XmlValidatingReader instance to ValidationType.Schema. However if I use xpath (XmlDocument's SelectSingleNode method ) to select node(s). It would not find any thing at all. Once I delete xmlns=http://tempuri.org/XMLSchema.xsd from the XML file it works fine? Could anyone please point out why I cannot retrieve data by Xpath after schema validation? Thank you very much

xuke0518 · Answer

Following your advice everything starts working now. It took me a couple of nights to find out. Thany you very much. your advice is very useful for me.

denkai · Answer

xmlns=http://tempuri.org/XMLSchema.xsd is a default namespace declaration. If you try to use xpath to retrieve nodes that are part of a namespace you must make your XPath namespace aware: XmlDocument dom = new XmlDocument(); XmlNamespaceManager ns = new XmlNamespaceManager(dom.NameTable); ns.AddNamespace(yhttp://tempuri.org/XMLSchema.xsd); dom.SelectSingleNode(//y:YourElementNamens); In the example above I used y as a prefix but this can be anything you want. regards Dominique LeBlond