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[Python-Dev] Unicode entities in XML cause problems :-(

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"Matthias Urlichs" <smurf@noris.de> writes:

> >>> import xml.dom.minidom as md
> >>> d=md.parseString("<foo>b&#2000;</foo>"))
> >>> d.writexml(sys.stdout)
> ...
> UnicodeError: ASCII encoding error: ordinal not in range(128)
[...]
> Thus, my proposal (which I'm going to implement since I need it...) is to
> write such a codec. For simplicity, I propose to accept &uuml; and &euro;
> and friends, but to emit them as &#1234; (or whatever).

The proper fix, IMO, is to have writexml accept an encoding argument,
and, by default, write the output as UTF-8. Then there is no need for
character or entity references.

In any case, emitting &uuml; and &euro; in XML is wrong: you cannot
use them unless your document type provides them - you should not
assume that all XML files use the HTML DTD.

> After this codec is written, all occurrences of string.replace('&','&amp;')
> (and vice versa) within the standard library can be replaced with the
> appropriate encode/decode methods. 

Please see http://python.org/sf/432401. Walter is working on such a
codec.

Regards,
Martin

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