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Re: "Malformed XML" (l10n?) problems on checkout

From: Julian Reschke <julian.reschke_at_gmx.de>
Date: 2005-02-16 21:46:58 CET

Dale Worley wrote:
>>From: Charles Bailey [mailto:bailey@newman.upenn.edu]
>>Sure. I think I've got it. By process of elimination, the
>>offending file
>>seems to be one named '.ooo^H^H^Htestff^Hile' (where ^H is
>>the usual \x08
>>backspace character). (No, I've no idea why the creator of
>>this file --
>>likely OpenOffice.org -- chose to use this name.)
> *Why* that file name exists is clear -- someone was trying to type a file
> name into a box. He typed ".ooo", and then decided he didn't like that, so
> he typed ^H three times, which moved the cursor back three spaces, then he
> typed "test", which wrote over the offending "ooo", but didn't actually
> remove them from the program's input buffer. Similarly, the final ^H was to
> correct the second "f" so he could replace it with "i". The name he thought
> he was getting was ".testfile".
> But you've identified the Subversion problem correctly -- a file name can
> contain "non-printable" characters, which are forbidden in XML. Worse, what
> you might think is a valid escape sequence to represent it -- &8; -- is also
> forbidden in XML, because "character entities" are forbidden from
> representing non-printable characters. See the discussion in
> http://www.w3c.org/TR/2004/REC-xml-20040204/#dt-charref
> Subversion may need to extend XML to allow this (and has to verify that its
> XML parser can deal with it).

No. Please. Do not "extend" XML. Extending it means breaking existing
clients that use conforming XML 1.0 parsers.

The proper way (WebDAV does that, so why not Subversion in other
places?) is to use URIs rather than names (they will never contain
control characters).

Best regards, Julian

<green/>bytes GmbH -- http://www.greenbytes.de -- tel:+492512807760
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Received on Wed Feb 16 21:48:18 2005

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