代码第二行出现这个错误
Characters following '<! ' do not fulfill production 'prolog'.
<! DOCTYPE root[
<! ELEMENT root(shop)+>
<! ELEMENT shop (name,address,size, pic * ,remark? )>
<! ELEMENT name(# PCDATA)>
<! ELEMENT address(# PCDATA)>
<! ELEMENT size(# PCDATA)>
<! ELEMENT pic(# PCDATA)>
<! ELEMENT remark(#PCDATA)>
<! ENTITY big "旗舰店">
<! ENTITY medium "中等">
<! ENTITY small "小型">
]>
< root >
物美