C1 Control Characters
There is a less common block of C1 control characters between 128 (#x80) and 159 (#x9F). These include start of string, end of string, cancel character, privacy message, and a few other equally obscure characters. For the most part these are even less useful and less appropriate for XML documents than the C0 control characters. However, they were allowed in XML 1.0 mostly by mistake. XML 1.1 rectifies this error (with one notable exception, which I'll address shortly) by requiring that these control characters be escaped with character references as well. For example, you can no longer include a “break permitted here” character in element content or attribute values. You have to write it as ‚ instead.
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