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@@ -223,6 +223,9 @@ Line endings are replaced by newline characters (LF).
A line containing no characters, or a line containing only spaces (after
tab expansion), is called a [blank line](@blank-line).
+For security reasons, a conforming parser must strip or replace the
+Unicode character `U+0000`.
+
# Blocks and inlines
We can think of a document as a sequence of