2004-03-12 .NET Framework http://www.microsoft.com/japan/msdn/library/default.asp?url=/japan/msdn/library/ja/netstart/html/sdkstart.asp System.Xml 名前空間 http://www.microsoft.com/japan/msdn/library/default.asp?url=/japan/msdn/library/ja/cpref/html/frlrfsystemxml.asp