XML 读写（命名空间）

http://www.w3school.com.cn/xml/xml_namespaces.asp (XML命名空间和xml详细内容）

http://www.w3.org/TR/REC-xml-names/

处理含有xml命名空间的读取

http://www.cnblogs.com/martin-chen/archive/2011/02/24/xml-studynote-namespace.html

http://msdn.microsoft.com/zh-cn/library/system.xml.xmlwriter.aspx （.net实现xml读写）

UTF8:

Many Windows programs (including Windows Notepad) add the bytes 0xEF, 0xBB, 0xBF at the start of any document saved as UTF-8. This is the UTF-8 encoding of the Unicode byte order mark (BOM), and is commonly referred to as a UTF-8 BOM, even though it is not relevant to byte order. The BOM can also appear if another encoding with a BOM is translated to UTF-8 without stripping it. Older text editors may display the BOM as "" at the start of the document.

 static void Main(string[] args)
        {

            using (MemoryStream ms = new MemoryStream())
            {

                XmlWriterSettings settings = new XmlWriterSettings();

                //要求缩进 

                settings.Indent = true;

                //注意如果不设置encoding默认将输出utf-16 
                //注意这儿不能直接用Encoding.UTF8如果用Encoding.UTF8将在输出文本的最前面添加3个字节的非xml内容 
                settings.Encoding = Encoding.UTF8;
                //settings.Encoding = new UTF8Encoding(false);

                //设置换行符 
                settings.NewLineChars = Environment.NewLine;

                using (XmlWriter xmlWriter = XmlWriter.Create(ms, settings))
                {
                    //写xml文件开始<?xml version="1.0" encoding="utf-8" ?> 
                     xmlWriter.WriteStartDocument(false);

                    //写根节点 
                    xmlWriter.WriteStartElement("root");

                    //写字节点 
                    xmlWriter.WriteStartElement("cat");

                    //给节点添加属性 
                    xmlWriter.WriteAttributeString("color", "white");

                    //给节点内部添加文本 
                    xmlWriter.WriteString("I'm a cat");

                    xmlWriter.WriteEndElement();


                    //通过WriteElementString可以添加一个节点同时添加节点内容 
                    xmlWriter.WriteElementString("pig", "pig is great");

                    xmlWriter.WriteStartElement("dog");

                    //写CData 
                    xmlWriter.WriteCData("<strong>dog is dog</strong>");
                    xmlWriter.WriteEndElement();

                    xmlWriter.WriteComment("this is an example writed by bob");

                    xmlWriter.WriteEndElement();
                    xmlWriter.WriteEndDocument();
                }

                //将xml内容输出到控制台中 
                string xml = Encoding.UTF8.GetString(ms.ToArray());
                Console.WriteLine(xml);

            }

            Console.Read(); 



        }

 结果 1. 使用UTF8: