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issue #1954 (was: Re: Supporting non-XML-safe pathnames)

From: <kfogel_at_collab.net>
Date: 2004-11-29 22:25:58 CET

VK Sameer <sameer@collab.net> writes:
> I'm not particularly interested in having filenames with control
> characters, it removes an easily creatable test case, for one :) It just
> happened to be a lead-in to non-XML-safe pathnames.
> But I am concerned about using svn_xml_is_xml_safe as it stands now as
> it doesn't reject of other invalid characters. I've attached a list of
> accepted characters to this email, please take a look.

I'd like to take a deep breath and get an overview of this issue
again. I've rethreaded it so it refers to issue #1954.

The Problem:
============

On the client side (and maybe over the wire, in DAV?) we use XML
attributes to hold path names, at least basenames. Thus, any
character that cannot be represented in an XML attribute value cannot
be used in a filename. Note that this is *not* the same as
prohibiting characters which cannot appear directly in an attribute
value. Some characters cannot appear directly, but perhaps can be
represented by escaping.

In order to solve this, we need to know exactly what can be
*represented* in an attribute value. Do we know the answer to that
yet? (For example, can we represent all valid UTF8 paths in an XML
attribute value?)

Once we know the answer to that basic question, we need to decide what
subset (possibly the entire set) we want to support.

VK Sameer, is this a reasonable summary? And do you happen to know
the answer to the first question?

-Karl

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Received on Mon Nov 29 22:30:01 2004

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