From: Vincent van Beveren <v.vanbeve...@rijnhuizen.nl>
To: Dave Kuhlman <dkuhl...@pacbell.net>
Sent: Tuesday, February 10, 2009 11:28:07 PM
Subject: RE: [Generateds-users] FW: Couple of issues writing XML
> Hi Dave,
>
> Thanks for your reply.
Vincent -
I've created a schema and an instance document that tries to test
several of the problems you've identified. I've attached the
following:
- My current working copy of generateDS.py.
- An XML Schema (data_schema_1.xsd)
- The code generated by generateDS.py from the XML Schema (tmp3sup.py and
tmp3sub.py).
- An XML instance document used as input (data_input_1.xml)
- An XML instance document that is the result of running the generated code
(data_output_1.xml)
Here is how I ran it:
$ ./generateDS.py -f --super=tmp3sup -o tmp3sup.py -s tmp3sub.py
data_schema_1.xsd
$ python tmp3sub.py data_input_1.xml
>
> As far as I am concerned, an element may
> only be represented as <x /> when it may not contain any children, and no
> character data. In any other case it is alright for me that it prints
> <x></x>.
The attached files have these test cases.
Just to make sure, I believe that you are saying that instead of
lines 3 and 4:
<item ident="1">
</item>
export should actually produce this:
<item ident="1" />
Is that right?
I'll start working on it.
The attached examples exposed another problem, I'm afraid. This:
<testvalue></testvalue>
should not have been exported, right?
>
> Another thing to look at (from the java
> perspective) is JAXB, which is almost exactly what generateDS does. Actually I
> was more familiar with Java then with Python before I started working on this
> project, and search for something similar to JAXB, when I found generateDS.
>
> The attribute story is more about default python
> values when I do not specify them in the XSD. For example:
It seems to me that the omitted values are handled correctly. When
a value is omitted, the generated code does not export the
attribute. Am I right about this? Is the attached code doing what
we want? Is it possible that you are using an older version of
generateDS.py?
Thanks for the suggestion about JAXB. I knew about XMLBeans, but
not JAXB. I'll take a look.
By the way, I don't know whether you have looked at Jython. The
Java code generated by XMLBeans is usable by Jython. I suspect
that Jython could also import and use the code generated by JAXB.
Not trying to talk you out of using generateDS.py, but in a more
Java oriented environment or shop, ...
More later.
- Dave
>
> <?xml version="1.0"?>
> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema";;>
> <xs:element name="Test">
> <xs:complexType>
> <xs:attribute name="integer" type="xs:int" use="optional" />
> </xs:complexType>
> </xs:element>
> </xs:schema>
>
> Would generate the following constructor:
>
> classTest(object):
> subclass = None
> superclass = None
> def__init__(self, integer=-1, valueOf_=''):
> self.integer
> = integer
> self.valueOf_
> = valueOf_
>
> Note that the integer is initialized to -1
>
> When the exportAttribute is ddefined as
> followed:
>
> defexportAttributes(self, outfile, level, namespace_='', name_='Test'):
> ifself.get_integer() isnotNone:
> outfile.write(' integer="%d"'% self.get_integer())
>
> Note that it does not check for -1, but
> for None. This would mean that if I do not specify the attribute, that it
> would
> render it as integer=”-1”, while the desired output is that it does
> not render the attribute at all. This would be fixed if the integer would be
> initialized to None.
>
> Regards,
> Vincent
>
--
Dave Kuhlman
http://www.rexx.com/~dkuhlman
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