From: Vincent van Beveren <v.vanbeve...@rijnhuizen.nl>
To: generateds-users@lists.sourceforge.net
Sent: Monday, February 9, 2009 11:53:54 PM
Subject: [Generateds-users] FW: Couple of issues writing XML
> Hi,
>
> I have posted this question a couple of
> months ago, yet received no reply. If by my ignorance I have asked stupid
> questions, please let me know.
>
> My main issue at this point is that empty
> elements are created as <foo></foo>, and wrong indentation. How can
> I resolve this issue so that empty elements are rendered correctly?
>
Vincent -
I apologize for not responding the first time. Give me a day or so
to look into the empty elements issue. Here are a couple of initial
comments:
- Question: Am I right that when an element is empty (has not
children or character content), that the code generated by
generaateDS.py should export:
<tag someattr="stuff" />
instead of:
<tag someattr="stuff">
</tag>
- Doing so would require that the generated code be able to check
whether a element is "empty" in some sense. Keep in mind that
one of your other issues is (generation of) default values. So,
if a child has only character content, we have to think about
what it means for that child to be empty.
- generateDS.py does have some support for the "default" attribute
on element declarations in XML Schemas. Does that help at all
with your needs? Here is an example:
<xs:element name="name" type="xs:string" minOccurs="0"
default="nobody" />
Hmmm. I wonder how XMLBeans handles this. XMLBeans is an Apache
project whose goal is similar to generateDS.py.
(http://xmlbeans.apache.org/) A major difference is that XMLBeans
generates Java code, not Python code. I'll go look.
Give me a day or so to think about this, and I'll report back. I
promise not to forget this time.
- Dave
--
Dave Kuhlman
http://www.rexx.com/~dkuhlman
>
>
> ________________________________
>
> From:Vincent van Beveren
> Sent: donderdag 6 november 2008
> 15:56
> To: ' generateds-users@lists.sourceforge.net '
> Subject: Couple of issues writing
> XML
>
> Hi everyone,
>
> Í’ve just started using generateDS, and am enjoying it
> so-far. I have, however, a couple of issues writing an XML file, and I am
> unsure if I am doing something wrong, or whether I’m forgetting
> something. I will list them below:
>
> - No header / namespace declaration:
> When I use the export(file) method on an element it doesn’t write any
> namespace / header stuff. Ofcourse that is understandable since the element
> itself doesn’t know it is the root. Now I can append <?xml
> version=”1.0”?> to the beginning of the file without modifying
> the generated code, however, the namespace declarations must be in the root
> element. Is there a way to achieve this automatically, or should I subclass
> the
> generated code and modify a specific method?
>
> - Complex-types always written with
> open/close tag: If I write an element which has no child-elements, still an
> open/close tag are created, my XML validator starts complaining that
> “Element 'BinaryVariable' must have no character or element information
> item [children], because the type's content type is empty.” on the
> generated XML. Also the indentation is messed up for the closing-tag (since it
> apparently expects children?). Maybe my XSD requires a special way of creating
> elements with no child-elements allowed?
>
> - Numeric element attributes
> initialized to -1: When I define optional attributes of type xs:int the
> constructor for the element containing these attributes initializes them to
> -1.
> The export function of the element checks whether or no the attribute-value is
> None (which it is not, its -1), so it writes all attribute values being -1.
> Now
> I have to explicitly set all values to a value, or None. It would seem more
> logical to me to set the default value of an attribute to None (unless its
> required, maybe). Is there a way to accomplish this?
>
> Thanks in advance for any insights / help!
>
> Regards,
> Vincent van Beveren
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