LINQ: .NET Language Integrated Query

LINQ: .NET Language Integrated Query: "LINQ to XML: XML Integration"

NET Language-Integrated Query for XML (LINQ to XML) allows XML data to be queried by using the standard query operators as well as tree-specific operators that provide XPath-like navigation through descendants, ancestors, and siblings. It provides an efficient in-memory representation for XML that integrates with the existing System.Xml reader/writer infrastructure and is easier to use than W3C DOM. There are three types that do most of the work of integrating XML with queries: XName, XElement and XAttribute.
XName provides an easy-to-use way to deal with the namespace-qualified identifiers (QNames) used as both element and attribute names. XName handles the efficient atomization of identifiers transparently and allows either symbols or plain strings to be used wherever a QName is needed

http://www.visli.com/