How do you declare a the “nbsp” entity in XML document

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I am getting the following error

The entity \"nbsp\" was referenced, but not declared.

I tried to declare the nbsp (shown below) in my XML file. But this isn

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谎友^

2021-01-16 04:15

Put the DOCTYPE declaration before the root element start-tag. That is,

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html [
   <!ENTITY nbsp "&#160;">
]>
<rss version="2.0"
  xmlns:content="http://purl.org/rss/1.0/modules/content/"
  xmlns:wfw="http://wellformedweb.org/CommentAPI/"
 >
 ...
</rss>

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