The entity "nbsp" was referenced, but not declared
翻譯
實體”“被引用，但沒有宣告
問題
使用xhtmlrenderer將網頁轉成PDF時報The entity "nbsp" was referenced, but not declared.異常；而某些頁面卻是正常。這個問題是頁面中包含了 導致的，而這個標記在頁面中使用是很正常且頻繁了。
原因
該問題是由於未定義HTML的DOCTYPE，致使SAX將內容按照xml預設定義進行解析，而xml中&開頭表示可解析的實體，這個實體被DTD預先定義
解決
方法1.
加入正確的DOCTYPE，如：<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
方法2.
html轉換為XML格式的時候html裡面含有 會出現The entity "nbsp" was referenced, but not declared.這個異常，解決的辦法是把 替換成 即可！
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