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Re: Well-formed BinXML

• To: kjones@s...
• Subject: Re: Well-formed BinXML
• From: Elliotte Harold <elharo@m...>
• Date: Sat, 29 Jan 2005 07:42:12 -0500
• Cc: xml-dev@l...
• In-reply-to: <200501281508.34809.kjones@s...>
• References: <200501281508.34809.kjones@s...>
• User-agent: Mozilla/5.0 (Macintosh; U; PPC Mac OS X Mach-O; en-US; rv:1.7.5) Gecko/20041217

Kevin Jones wrote:


> I have a small list of constraints that need to be added 
> which are not implicitly guaranteed by this encoding. Just 
> wondering if anybody can think of any others I should be 
> looking at that would not typically be for free as part of 
> this type of binary encoding. 


It's hard to suggest because we don't know what is guaranteed by the 
encoding. However, another thing that jumps out is the test for legal 
characters: e.g. no unmatched surrogate pairs and no C0 controls except 
the three allowed ones (\r, \n, and \t). And of course there are also 
namespace constraints.

Finally, I would not assume that the encoding guarantees everything 
unless you check that the document is correctly encoded. The parser 
should assume that any and all bits might have been randomly or 
non-randomly flipped, and should detect any problems that result. That 
is, do not assume that the document was created by a conforming encoder. 
This is similar to how the Java virtual machine verifies byte codes and 
notices problems that occur even if certain byte code sequences could 
not have been created by javac.

-- 
Elliotte Rusty Harold  elharo@m...
XML in a Nutshell 3rd Edition Just Published!
http://www.cafeconleche.org/books/xian3/
http://www.amazon.com/exec/obidos/ISBN=0596007647/cafeaulaitA/ref=nosim

• References:
  • Well-formed BinXML
    • From: Kevin Jones <kjones@s...>

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