XmlLayout allows output of invalid control characters
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Key: LOG4NET-22
URL: http://issues.apache.org/jira/browse/LOG4NET-22
Project: Log4net
Type: Bug
Components: Appenders
Versions: 1.2.9
Reporter: Nicko Cadell
XmlLayout allows output of invalid control characters.
Reported by Mike Blake-Knox with additional comments from Curt Arnold.
The XmlLayout encodes the character 0x1e as  using the standard XML
numeric character reference.
This character code is in a range which is not allowed to appear in XML 1.0
either as a un-encoded value or as a numeric character reference.
The valid character ranges are defined here in the XML recommendation:
http://www.w3.org/TR/REC-xml/#charsets
They are:
#x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
Numeric character references are not able to express characters from outside
these ranges.
The System.Xml.XmlTextWriter does not verify if the unicode character is valid
in XML, but it does encode it as a numeric character reference if it cannot be
expressed in the output encoding.
To complicate matters further XML 1.1 does allow further, so called restricted
characters, to be included in the output if they are encoded as numeric
character references. These ranges are:
[#x1-#x8] | [#xB-#xC] | [#xE-#x1F] | [#x7F-#x84] | [#x86-#x9F]
See http://www.w3.org/TR/2004/REC-xml11-20040204/#charsets for details.
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