Message
No character encoding was specified
Explanation
The XML document doesn't declare a character encoding. According to the standard it will be treated as UTF-8, but this may not be correct.
Solution
If the document uses something other than UTF-8, you must add an explicit declaration as the very first line of the document:
<?xml version="1.0" encoding="encoding-name"?>
where encoding-name is windows-1252, iso-8859-1, or whichever encoding the document is written with. If this is a perfectly valid UTF-8 document, adding the declaration avoids ambiguity.
If you are not sure what encoding your tooling uses, following the instructions in the Survivial Guide to i18n
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