All XML validation in Qt is based on XML 1.0 (and not the newer 1.1 standard).
I found at least 3 places where validity is checked:
1. in qxmlstream.cpp:
Method resolveCharRef:
//checks for validity
ok &= (s == 0x9 || s == 0xa || s == 0xd || (s >= 0x20 && s <= 0xd7ff)
|| (s >= 0xe000 && s <= 0xfffd) || (s >= 0x10000 && s <=
QChar::LastValidCodePoint));
Method scanUntil:
//checks for invalidity
if (c < 0x20 || (c > 0xFFFD && c < 0x10000) || c >
QChar::LastValidCodePoint )
2. In qxmlutils.cpp:
bool QXmlUtils::isChar(const QChar c)
{
return (c.unicode() >= 0x0020 && c.unicode() <= 0xD7FF)
|| c.unicode() == 0x0009
|| c.unicode() == 0x000A
|| c.unicode() == 0x000D
|| (c.unicode() >= 0xE000 && c.unicode() <= 0xFFFD);
}
It is pretty much the same as the above checks, except that it doesn't check
for characters in the range 0x10000 - 0x10FFFF.
It think this is a bug, especially because the source is referring to the
standard at http://www.w3.org/TR/REC-xml/#NT-Char, which says:
[2] Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] |
[#xE000-#xFFFD] | [#x10000-#x10FFFF] /* any Unicode character, excluding the
surrogate blocks, FFFE, and FFFF. */
------------------------------------
Now, I have three questions:
1. Can someone confirm if the check in QXmlUtils is actually a bug?
2. Wouldn't it be better to move these checks to QChar, so that at least there
is only one implementation?
3. Is there a reason to stick to XML1.0, or should Qt also implement the XML1.1
standard?
According to the XML 1.1 standard (http://www.w3.org/TR/xml11/#charsets),
allowed characters are:
[2] Char ::= [#x1-#xD7FF] | [#xE000-#xFFFD] |
[#x10000-#x10FFFF] /* any Unicode character, excluding the surrogate
blocks, FFFE, and FFFF. */
[2a] RestrictedChar ::= [#x1-#x8] | [#xB-#xC] | [#xE-#x1F] | [#x7F-#x84] |
[#x86-#x9F]
So the allowed character range is a little bit extended (now includes all
characters between 0x0001 and 0x0020). In addition, XML1.1 has defined some
characters to be highly discouraged, but still valid.
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