Re: [Generateds-discuss] How to create/ generate new xml from generated API

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Daniel,

Thanks for taking the time to report this.

Here is what I've tried so far:

1. I copied TestResults.xml and Common.xsd to a directory.

2. I ran the following command:

        ./generateDS.py -f -o tmp01sup.py -s tmp01sub.py --super  
tmp01sup --member-specs=dict '--export=write etree validate'  
TestResults.xsd

    That generated a module `tmp01sup.py`.

3. So, I started IPython (the plain Python interactive prompt would
    also work) and did this:

        [ins] In [1]: import tmp01sup as lib

    Which also worked.

4. Then I created an instance of a class in the generated module:

        [ins] In [5]: testresults01 = lib.TestResult()
        [ins] In [6]: testresults01.export(sys.stdout, 0)
        <c:TestResult   
xmlns:None="http://www.ieee.org/ATML/2006/Common"   
xmlns:c="http://www.ieee.org/ATML/2006/Common" />

    Which also seemed to work.

So, now I've got to read your message a bit more carefully so that I
can figure out what is wrong for your case and how to fix it.

I do not have the file `collect_schema_locations.py`, which you show
in your message as generating an exception.  So, I can't test that.
Did you generate that file with `generateDS.py`?

However the exception "TypeError: empty namespace prefix is not
supported in XPath" seems to occur when you have a key in the nsmap
that is `None`.  Try removing it.  Then do the `xpath` search:

     [ins] In [23]: nsmap = root.nsmap
     [ins] In [24]: nsmap
     Out[24]:
     {'xs': 'http://www.w3.org/2001/XMLSchema',
      'c': 'http://www.ieee.org/ATML/2006/Common',
      None: 'http://www.ieee.org/ATML/2007/TestResults'}
     [ins] In [25]: nsmap.pop(None)
     Out[25]: 'http://www.ieee.org/ATML/2007/TestResults'
     [ins] In [26]: nsmap
     Out[26]:
     {'xs': 'http://www.w3.org/2001/XMLSchema',
      'c': 'http://www.ieee.org/ATML/2006/Common'}
     [ins] In [27]: root.xpath('xs:import', namespaces=nsmap)
     Out[27]: [<Element {http://www.w3.org/2001/XMLSchema}import at  
0x7faf573acac0>]

Does that help with your work?

By the way, the "--one-file-per-xsd" capability is something that I
do not understand, myself.  That code was contributed by someone
else.

Dave

Quoting "Dewitte, Daniel W (US) via Generateds-discuss"  
<gen...@li...>:

> Here are the actual files this time :)
>
> Daniel DeWitte
>
> T:  +1-603-885-2602
> M: +1-603-759-4476
> E: dan...@ba...<mailto:dan...@ba...>
>
> From: Dewitte, Daniel W (US)
> Sent: Wednesday, June 1, 2022 1:06 PM
> To: 'Gen...@li...'  
> <Gen...@li...>
> Subject: How to create/ generate new xml from generated API
>
> Hi Dave,
>
> This is one of the better tools that I have found and I think the  
> only one that can work the way I need it too, I just need some help  
> with getting to the finish line.
>
> My goal is generate a new .xml using a known schema .xsd with Python  
> as the base language (required).  I have 13 different reports that  
> all have a different format that are generated on a constant basis  
> that I need to import into a known .xsd format for upload to a  
> database.
>
> I believe I either want to use the build methods, or the "one-per"  
> options, but I can't get either of them to work.  I asked about the  
> build method problem on stackover flow here:  Stackoverflow -  
> Creating a new XML from an XSD using GenerateDS and  
> Python<https://stackoverflow.com/questions/72397436/creating-a-new-xml-from-an-xsd-using-generateds-and-python>
>
> But I am not sure that the build method is what I want to use.
>
> When I try the "one-per" I get the following errors:
> Command line method, I believe this error is due to that the .xsd is  
> in a UTF-8 encoding.  How do I get this to work with UTF-8 encoding?
>> (base) H:\Python Training\GenerateDS_Docs>python generateds.py  
>> --one-file-per-xsd --output-directory="OnePer"  
>> --module-suffix="One" TestResults.xsd
>> Traceback (most recent call last):
>> File "H:\Python Training\GenerateDS_Docs\generateds.py", line 9906,  
>> in <module>
>     main()
>> File "H:\Python Training\GenerateDS_Docs\generateds.py", line 9872, in main
>     parseAndGenerate(
>> File "H:\Python Training\GenerateDS_Docs\generateds.py", line 9318,  
>> in parseAndGenerate
>     parser.parse(rootFile)
>> File "C:\EngTools\Anaconda3\lib\xml\sax\expatreader.py", line 111, in parse
>     xmlreader.IncrementalParser.parse(self, source)
>> File "C:\EngTools\Anaconda3\lib\xml\sax\xmlreader.py", line 123, in parse
>     buffer = file.read(self._bufsize)
>> File "C:\EngTools\Anaconda3\lib\encodings\cp1252.py", line 23, in decode
>     return codecs.charmap_decode(input,self.errors,decoding_table)[0]
>> UnicodeDecodeError: 'charmap' codec can't decode byte 0x9d in  
>> position 4013: character maps to <undefined>
>
> Approach 2 - Extraction and Generation Utilities:
>> (base) h:\Python Training\GenerateDS_Docs\utils>python  
>> collect_schema_locations.py --force --verbose TestResults.xsd  
>> testJson.txt
>> Traceback (most recent call last):
>> File "h:\Python  
>> Training\GenerateDS_Docs\utils\collect_schema_locations.py", line  
>> 157, in <module>
>     main()
>> File "h:\Python  
>> Training\GenerateDS_Docs\utils\collect_schema_locations.py", line  
>> 148, in main
>     extract_and_generate(infile, outfile, extract_locations_fn, options)
>> File "h:\Python  
>> Training\GenerateDS_Docs\utils\collect_schema_locations.py", line  
>> 86, in extract_and_generate
>     locations = extract_locations(infile, options)
>> File "h:\Python  
>> Training\GenerateDS_Docs\utils\collect_schema_locations.py", line  
>> 50, in extract_locations
>     elements = root.xpath('xs:import', namespaces=root.nsmap)
>> File "src/lxml/etree.pyx", line 1579, in lxml.etree._Element.xpath
>> File "src/lxml/xpath.pxi", line 259, in  
>> lxml.etree.XPathElementEvaluator.__init__
>> File "src/lxml/xpath.pxi", line 131, in  
>> lxml.etree._XPathEvaluatorBase.__init__
>> File "src/lxml/xpath.pxi", line 55, in lxml.etree._XPathContext.__init__
>> File "src/lxml/extensions.pxi", line 81, in lxml.etree._BaseContext.__init__
>> TypeError: empty namespace prefix is not supported in XPath
>
> Attached are the .xsd that I am using.  TestResults.xsd references  
> Common.xsd.
>
> Any help on getting started with my overall goal will be much  
> appreciated.  I am looking to create a new XML from a known .xsd and  
> add in the elements and child elements and attributes as needed.
>
> Thank you for the help,
> Daniel DeWitte

-- 
Dave Kuhlman
http://www.davekuhlman.org