closed issue

Imbaud Pierre pierre at saiph.com
Mon Jan 8 17:14:43 CET 2007


I submitted a bug, to sourceforge. Was answered (pretty fast) the file
I dealt with was the buggy part. I then submitted a bug to the file
author, who agreed, and fixed. End of the story.
All I could complain about, with the xml.dom library, is how obscure
the exception context was: I did violate SOME xml rule, ideally the
exception should show the rule, and the faulty piece of data. But I
know this has a cost, both runtime cost and developper-s time cost.

Imbaud Pierre a écrit :
> I am using the standard xml library to create another library able to 
> read, and maybe write,
> xmp files.
> Then an xml library bug popped out:
> xml.dom.minidom was unable to parse an xml file that came from an 
> example provided by an official organism.(http://www.iptc.org/IPTC4XMP)
> The parsed file was somewhat hairy, but I have been able to reproduce 
> the bug with a simplified
> version, that goes:
> 
> <?xpacket begin='' id='W5M0MpCehiHzreSzNTczkc9d'?>
> <x:xmpmeta xmlns:x='adobe:ns:meta/' x:xmptk='XMP toolkit 3.0-28, 
> framework 1.6'>
> <rdf:RDF xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#' 
> xmlns:iX='http://ns.adobe.com/iX/1.0/'>
> 
>  <rdf:Description rdf:about='uuid:f5b64178-9394-11d9-bb8e-a67e6693b6e9'
>   xmlns:xmpPLUS='XMP Photographic Licensing Universal System (xmpPLUS, 
> http://ns.adobe.com/xap/1.0/PLUS/)'>
>   <xmpPLUS:CreditLineReq>False</xmpPLUS:CreditLineReq>
>   <xmpPLUS:ReuseAllowed>False</xmpPLUS:ReuseAllowed>
>  </rdf:Description>
> 
> </rdf:RDF>
> </x:xmpmeta>
> <?xpacket end='w'?>
> 
> The offending part is the one that goes: xmpPLUS='....'
> it triggers an exception: ValueError: too many values to unpack,
> in  _parse_ns_name. Some debugging showed an obvious mistake
> in the scanning of the name argument, that goes beyond the closing
> " ' ".
> 
> Im aware I dont give here enough matter to allow full understanding
> of the bug. But thats not the place for this, and thats not my point.
> 
> Now my points are:
> - how do I spot the version of a given library? There is a __version__
>   attribute of the module, is that it?
> - How do I access to a given library buglist? Maybe this one is known,
>   about to be fixed, it would then be useless to report it.
> - How do I report bugs, on a standard lib?
> - I tried to copy the lib somewhere, put it BEFORE the official lib in
>   "the path" (that is:sys.path), the stack shown by the traceback
>   still shows the original files being used. Is there a special
>   mechanism bypassing the sys.path search, for standard libs? (I may
>   be wrong on this, it seems hard to believe...)
> 
> - does someone know a good tool to validate an xml file?
> 
> 
> btw, my code:
> 
> from nxml.dom import minidom
> ...
> class whatever:
>     def __init__(self, inStream):
>         xmldoc = minidom.parse(inStream)
> 
> 
> 
> Thanks for any help...




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