Edwin,
Good to hear from you.
You did not mention how you created the instances of the Python data
binding classes (generated by generateDS.py from your schema). Did
you (1) create them by using those classes to parse an XML instance
document and then export it to XML? Or, (2) did you create those
instances manually by writing your own Python code?
If you did the second, then there is a special way in which your
Python code must create those instances so that they know that they
must export themselves with the xsi:type="xxx" attribute.
I recently had a question about this same issue, again *if* it's the
second way of creating instances that we are talking about. If it
is, then you can either take a look at my answer to a question about
that issue here:
https://sourceforge.net/p/generateds/mailman/message/36433595/
Or, better yet, I believe, look at this addition I made in response
to that question to the `generateDS` documentation in section "Types
derived by extension":
http://www.davekuhlman.org/generateDS.html#types-derived-by-extension
Here is an attempt to reproduce what I *think* you are trying to do:
I generated a module from `EsdlXML.xsd`:
$ ./generateDS.py -o esdlxmllib.py EsdlXML.xsd
Then I ran this Python code:
# sample03.py
import sys
import esdlxmllib
def test():
instance = esdlxmllib.Instance()
area = esdlxmllib.Area()
asset = esdlxmllib.WindTurbine()
asset.original_tagname_ = 'Asset'
asset.extensiontype_ = 'WindTurbine'
area.add_asset(asset)
instance.area = area
instance.export(sys.stdout, 0)
test()
And, it printed out this:
$ python sample03.py
<esdl:Instance xmlns:esdl="http://www.tno.nl/esdl/180901";>
<esdl:area xmlns:esdl="http://www.tno.nl/esdl/180901";>
<esdl:Asset
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:type="WindTurbine"/>
</esdl:area>
</esdl:Instance>
Is that what you are trying to get? I've attached the above sample
code (sampe03.py), in case it's helpful.
If the above does not help you solve your problem, please give me a
little more information to work with, so that I can reproduce your
problem.
Dave
On Sat, Oct 13, 2018 at 04:37:06PM +0000, Matthijssen, E.F. (Edwin) via
generateds-users wrote:
> Hello,
>
> We've developed a model for energy systems using the Eclipse
> Modeling Framework and we're trying to use GenerateDS to create
> python classes. The project is hosted here:
> https://github.com/EnergyTransition/ESDL-Python
>
> A picture of the class diagram can be found here:
> https://github.com/EnergyTransition/ESDL/blob/master/esdl/model/esdl.png
>
> The Eclipse tooling allows exporting the model as an XML schema
> definition. There are two different options: - An xsd based on
> XML:
> https://github.com/EnergyTransition/ESDL-Python/blob/master/model/EsdlXML.xsd
> - An xsd based on XMI:
> https://github.com/EnergyTransition/ESDL-Python/blob/master/model/esdlXMI.xsd
>
> No matter what xsd we use as an input, we get undesired output
> when we try to write an instance of a EnergySystem to a file.
>
> The problem exists where we use a collection of an abstract class,
> with many sub classes. In the example below area is an instance of
> class Area. An Area can contain 0 to many (0..*) Assets. Asset is
> an abstract class and WindTurbine is a subclass of Asset.
>
> The desired output should look like this:
>
> <esdl:EnergySystem>
> <esdl:instance>
> <esdl:area>
> <esdl:asset xsi:type="esdl:WindTurbine">
> ...
> </esdl:asset>
> </esdl:area>
> </esdl:instance>
> </esdl:EnergySystem>
>
> Using the XML version of the XSD, the output looks like:
>
> <esdl:EnergySystem>
> <esdl:instance>
> <esdl:area>
> <esdl:WindTurbine>
> ...
> </esdl:WindTurbine>
> </esdl:area>
> </esdl:instance>
> </esdl:EnergySystem>
>
> Using the XMI version of the XSD, the output looks like:
>
> <esdl:EnergySystem>
> <esdl:instance>
> <esdl:area>
> <esdl:asset>
> ...
> </esdl:asset>
> </esdl:area>
> </esdl:instance>
> </esdl:EnergySystem>
>
> Any ideas how to get this right? Any help is highly appreciated
>
> Regards,
> Edwin
>
>
>
>
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--
Dave Kuhlman
http://www.davekuhlman.org
import sys
import esdlxmllib
def test():
instance = esdlxmllib.Instance()
area = esdlxmllib.Area()
asset = esdlxmllib.WindTurbine()
asset.original_tagname_ = 'Asset'
asset.extensiontype_ = 'WindTurbine'
area.add_asset(asset)
instance.area = area
instance.export(sys.stdout, 0)
test()
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