XML XPath Expressions

XPath Expressions
Following are some of the expressions that you can use to select one or more nodes from the XML document above:

• /userinfo - Selects the root element.
• /userinfo/username - Selects the username node which is the child of userinfo root node.
• //email - Selects all the nodes in the document which match the name (email) irrespective of where they lie in the document.
• //username[@admin] - Selects all nodes with the name of "username" which have an attribute; "admin".
• /userinfo/username[1] - Selects the first username node that is the child of userinfo node.
• /userinfo/username[last()] - Assuming userinfo had more than one username child nodes, it will return the last username node that is the child of userinfo node.

 

相关文章：

Introduction to XML

Reading XML Files with ASP.NET

Introduction to XPath for ASP.NET Developers

Creating new XML Document in ASP.NET Programmatically

Introduction to DTD (Document Type Definition)

Validating an XML Document using DTD in ASP.NET