将XML声明之前的注释放在XML文件中可以吗？
<!-- Is this bad to do? --> <?xml version="1.0" encoding="utf-8"?> <someElement />
不，不行
Because each XML entity not
accompanied by external encoding
information and not in UTF-8 or UTF-16
encoding must begin with an XML
encoding declaration,in which the
first characters must be ‘< ?xml’,any
conforming processor can detect,after
two to four octets of input,which of
the following cases apply.
啊，但是，F节是非规范的，你说。
那么，section 2.1给出了一个格式良好的XML文档的生产，因此：
[1] document ::= prolog element Misc*
…在section 2.8我们得到了“prolog”的生产：
[22] prolog ::= XMLDecl? Misc* (doctypedecl Misc*)? [23] XMLDecl ::= '<?xml' VersionInfo EncodingDecl? SDDecl? S? '?>'
所以，你可以省略< ？xml声明，但你不能用任何东西前缀。 (顺便提及，“杂项”是评论的类别)。