![The processing instruction target matching "[xX][mM][lL]" is not allowed.](https://image.shishitao.com:8440/aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzE3MS9kMjc2OTRkNjcyZTExZWNlNTM3NDU0YWI1MWZkNmUwMy5wbmc%3D.png?w=700&webp=1 "The processing instruction target matching \"[xX][mM][lL]\" is not allowed.")
原因：<?xml version="1.0" encoding="UTF-8"?>
前有空格
![The processing instruction target matching "[xX][mM][lL]" is not allowed.](https://image.shishitao.com:8440/aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzQxOS8wNWIzZjgyYzI1ODI1MWQ4YTMwOWMxNWUzZjY2ZGE0My5wbmc%3D.png?w=700&webp=1 "The processing instruction target matching \"[xX][mM][lL]\" is not allowed.")
去掉空格：
![The processing instruction target matching "[xX][mM][lL]" is not allowed.](https://image.shishitao.com:8440/aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzMyNy9hNzAwMmFkNDA3NWE1MWRjYTdhMmIzZGZjOWVhNjg4Zi5wbmc%3D.png?w=700&webp=1 "The processing instruction target matching \"[xX][mM][lL]\" is not allowed.")
又多出来个叹号，提示：Nogrammar constraints (DTD or XML schema) detected for the document
我在下面加上了<!DOCTYPE xml>
![The processing instruction target matching "[xX][mM][lL]" is not allowed.](https://image.shishitao.com:8440/aHR0cHM6Ly9waWFuc2hlbi5jb20vaW1hZ2VzLzkyMi85NTYyYTVjMTdlYTJmMTdiNDVkOTI1ZDdhOTY1NzllMi5wbmc%3D.png?w=700&webp=1 "The processing instruction target matching \"[xX][mM][lL]\" is not allowed.")
至于为什么呢，我还是个菜鸟，请各路大神赐教！
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