OK, how should I provide the schema to pyxb so that it can decode such
documents? The XSD which I need my documents to conform to is the one from
which I'm generating the code.
On Wed, Oct 19, 2011 at 17:46, Peter Bigot <big...@acm.org> wrote:
> On Wed, Oct 19, 2011 at 11:22 AM, Marcin Tustin
> <marcin.tus...@gmail.com>wrote:
>
>> Hi Peter,
>>
>> Thanks for this. Unless I'm mistaken, namespace URIs are not required to
>> map to any resource at all, let alone an XSD. However, the xsd from which
>> I'm generating the code is at
>> http://xmlgw.companieshouse.gov.uk/v2-1/schema/Egov_ch-v2-0.xsd.
>>
>
> That schema is for namespace http://www.govtalk.gov.uk/CM/envelope.
>
> What is PyXB expecting in its input that could be leading to this? Does it
>> rely on namespaces naming XSD files?
>>
>
> No, PyXB treats namespaces as URIs, not URLs, and has no expectation that
> they can be dereferenced. (It may, when generating bindings, make some
> attempt to locate the schema from an xsi:schemaLocation attribute, but that
> shouldn't happen when parsing.)
>
> The example documents (from the link you provided) do not reference the
> namespace http://www.govtalk.gov.uk/CM/
> envelope. They both specify that the default namespace is
> http://www.govtalk.gov.uk/schemas/govtalk/govtalkheader. Unless you have
> a schema for that namespace, PyXB won't be able to decode the content of the
> document.
>
> If the document doesn't specify a default namespace I believe it would fall
> back to the one you used as the CreateFromDocument call, but when the
> document does specify a namespace it's expected to be correct.
>
> Try editing the document and correcting the xmlns= attribute at the root so
> it has the same namespace as the module you're using to parse it.
>
> Peter
>
>
>>
>> On Wed, Oct 19, 2011 at 16:49, Peter Bigot <big...@acm.org> wrote:
>>
>>> On Wed, Oct 19, 2011 at 10:32 AM, Marcin Tustin <marcin.tus...@gmail.com
>>> > wrote:
>>>
>>>> Hi all,
>>>>
>>>> I'm making my first contact with pyxb, and so far it seems to only exist
>>>> to generate odd errors.
>>>>
>>>> I've tried to have it parse a document with:
>>>>
>>>> > import govtalkenvelope as g
>>>> > g.CreateFromDocument("""[xml taken from
>>>> http://xmlgw.companieshouse.gov.uk/example_http.html]""";)
>>>> Traceback (most recent call last):
>>>> File "<stdin>", line 35, in <module>
>>>> File "govtalkenvelope.py", line 32, in CreateFromDocument
>>>> saxer.parse(StringIO.StringIO(xml_text))
>>>> File "C:\Python27\Lib\xml\sax\expatreader.py", line 107, in parse
>>>> xmlreader.IncrementalParser.parse(self, source)
>>>> File "C:\Python27\Lib\xml\sax\xmlreader.py", line 123, in parse
>>>> self.feed(buffer)
>>>> File "C:\Python27\Lib\xml\sax\expatreader.py", line 207, in feed
>>>> self._parser.Parse(data, isFinal)
>>>> File "C:\Python27\Lib\xml\sax\expatreader.py", line 338, in
>>>> start_element_ns
>>>> AttributesNSImpl(newattrs, qnames))
>>>> File
>>>> "C:\Users\Marcin\Documents\oneclickcos\lib\site-packages\pyxb\binding\sax
>>>> er.py", line 310, in startElementNS
>>>> element_binding = name_en.elementBinding()
>>>> File
>>>> "C:\Users\Marcin\Documents\oneclickcos\lib\site-packages\pyxb\namespace\_
>>>> _init__.py", line 96, in __getattr__
>>>> category_value =
>>>> self.namespace().categoryMap(name).get(self.localName())
>>>> File
>>>> "C:\Users\Marcin\Documents\oneclickcos\lib\site-packages\pyxb\namespace\_
>>>> _init__.py", line 293, in categoryMap
>>>> raise pyxb.NamespaceError(self, '%s has no category %s' % (self,
>>>> category))
>>>> pyxb.exceptions_.NamespaceError:
>>>> http://www.govtalk.gov.uk/schemas/govtalk/govta
>>>> lkheader has no category elementBinding
>>>>
>>>
>>> It's probably saying it doesn't know how to deal with the
>>> http://www.govtalk.gov.uk/schemas/govtalk/govtalkheader namespace.
>>> Certainly it isn't clear to me where to find a schema for that namespace;
>>> the xsiLocation URI in the sample resolves to a web page, not a schema.
>>>
>>> Did you generate bindings for that namespace? How?
>>>
>>>
>>>>
>>>> Needless to say, it's less than clear what this is supposed to mean.
>>>> Any suggestions as to what might be causing this, or indeed how in general
>>>> to deal with pyxb's exception messages?
>>>>
>>>
>>> Experience is the only guide. Sorry, PyXB development is unfunded, so
>>> making it user friendly hasn't gotten much attention.
>>>
>>> Peter
>>>
>>>
>>>>
>>>> Marcin
>>>>
>>>> --
>>>> Marcin Tustin
>>>> Tel: 07773 787 105
>>>>
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> All the data continuously generated in your IT infrastructure contains a
>>>> definitive record of customers, application performance, security
>>>> threats, fraudulent activity and more. Splunk takes this data and makes
>>>> sense of it. Business sense. IT sense. Common sense.
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>>>> pyxb-users mailing list
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>>>>
>>>>
>>>
>>
>>
>> --
>> Marcin Tustin
>> Tel: 07773 787 105
>>
>>
>
--
Marcin Tustin
Tel: 07773 787 105
------------------------------------------------------------------------------
All the data continuously generated in your IT infrastructure contains a
definitive record of customers, application performance, security
threats, fraudulent activity and more. Splunk takes this data and makes
sense of it. Business sense. IT sense. Common sense.
http://p.sf.net/sfu/splunk-d2d-oct
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