Following the usual cookbook examples, my app parses an open file as
follows::
parser = xml.sax.make_pa rser()
parser.setFeatu re(xml.sax.hand ler.feature_ext ernal_ges,1)
# Hopefully the content handler can figure out the encoding from the <?xml>
element.
handler = saxContentHandl er(c,inputFileN ame,silent)
parser.setConte ntHandler(handl er)
parser.parse(th eFile)
Can anyone tell me how the content handler can determine the encoding of the
file? Can sax provide this info?
Thanks!
Edward
--------------------------------------------------------------------
Edward K. Ream email: ed*******@chart er.net
Leo: http://webpages.charter.net/edreamleo/front.html
--------------------------------------------------------------------
Oct 4 '06
19  2595 
Edward K. Ream wrote:
I'm asking this question because my app needs it :-) Imo, there is *no*
information in any xml file that can be considered irrelvant.
the encoding isn't *in* the XML file, it's an artifact of the
serialization model used for a specific XML infoset. the XML
data is pure Unicode.
</F>
Edward K. Ream wrote:
What suits me best is what the *user* specified, and that got put in the
first xml line.
are you expecting your users to write XML by hand? ouch.
</F>
are you expecting your users to write XML by hand?
Of course not. Leo has the following option:
@string new_leo_file_en coding = utf-8
Edward
--------------------------------------------------------------------
Edward K. Ream email: ed*******@chart er.net
Leo: http://webpages.charter.net/edreamleo/front.html
--------------------------------------------------------------------
Please consider adding some elements to the document itself that
describe the desired output format,
Well, that's what the encoding field in the xml line was supposed to do.
Not a bad idea though, except it changes the file format, and I would really
rather not do that.
Edward
--------------------------------------------------------------------
Edward K. Ream email: ed*******@chart er.net
Leo: http://webpages.charter.net/edreamleo/front.html
--------------------------------------------------------------------
the encoding isn't *in* the XML file, it's an artifact of the
serialization model used for a specific XML infoset. the XML
data is pure Unicode.
Sorry, but no. The *file* is what I am talking about, and the way it is
encoded does, in fact, really make a difference to some users. They have a
right, I think, to expect that the original encoding gets preserved when the
file is rewritten.
Edward
--------------------------------------------------------------------
Edward K. Ream email: ed*******@chart er.net
Leo: http://webpages.charter.net/edreamleo/front.html
--------------------------------------------------------------------
Edward K. Ream schrieb:
Can anyone tell me how the content handler can determine the encoding of the
file? Can sax provide this info?
That's not supported in SAX. If you use Expat directly (module pyexpat),
you can set the XmlDeclHandler, which is called when the XML declaration
is received (with the parameters version, encoding, and standalone).
However, as the XML declaration is optional, this callback might
not get invoked.
Regards,
Martin
Edward K. Ream wrote:
>Please consider adding some elements to the document itself that
describe the desired output format,
Well, that's what the encoding field in the xml line was supposed to do.
As others have tried to explain, the encoding in the xml header is
not part of the document data itself, it says something about the data.
It would be a bad design decision imo to rely on this meta information
if you really meant that information to be part of the data document.
Not a bad idea though, except it changes the file format, and I would really
rather not do that.
XML allows you to easily skip any elements that you think you don't need.
--Irmen
Irmen de Jong schrieb:
As others have tried to explain, the encoding in the xml header is
not part of the document data itself, it says something about the data.
It would be a bad design decision imo to rely on this meta information
if you really meant that information to be part of the data document.
A common problem is to save the data in the same encoding that they
original had; this is what an editor typically does (you may know
Edward Ream for writing editors). XML parsers are notoriously bad
in supporting editors. There are too many lexical details that may
need to be preserved (such as the order of the attributes, and the
spaces inside the opening tag) to make it impractical to report all
that to the application.
IMO, the only way to edit XML on a level that does preserving
of the tiniest lexical details is to edit it as plain text
(i.e. without using an XML parser).
Regards,
Martin
Martin v. Löwis wrote:
A common problem is to save the data in the same encoding that they
original had; this is what an editor typically does (you may know
Edward Ream for writing editors). XML parsers are notoriously bad
in supporting editors. There are too many lexical details that may
need to be preserved (such as the order of the attributes, and the
spaces inside the opening tag) to make it impractical to report all
that to the application.
an editor designed to work on the XML serialization level shouldn't use
a traditional XML parser at all, of course. definitely not SAX or DOM,
or any other infoset-or-higher-level API.
on the other hand, an editor that just happens to use XML as a
serialization format might as well decide on a model representation
and an encoding and stick to it. being tolerant in what it accepts
is a good idea, of course, but being consistent in what it generates
is an even better idea.
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