如果給xml增加&nbsp聲明

在xml中加入一段代碼

<!DOCTYPE inline_dtd [
<!ENTITY nbsp " ">
<!ENTITY copy "©">
<!ENTITY reg "®">
<!ENTITY trade "™">
<!ENTITY mdash "—">
<!ENTITY ldquo "“">
<!ENTITY rdquo "”"> 
<!ENTITY pound "£">
<!ENTITY yen "¥">
<!ENTITY euro "€">
]>

參考：https://stackoverflow.com/questions/9625602/how-to-display-nbsp-in-xml-output