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Entities and NCRs
When to use escapes
Syntax-related characters
<
(<)
>
(>)
&
(&)
"
(")
Characters not supported by the document encoding
It may be better to change the encoding!
Characters not supported by the input tools
Not a long term solution!
Characters that are invisible or ambiguous
eg. ‏ / ‏
eg. /  
When to use escapes