Re: [pyxb-users] Issues in creating a XML message with unbounded sequence

[Peter A. B. <bi...@ac...>]

 > 1) Why the output is different from the input? Am I missing something?

Depends on which difference you mean.  PyXB does not preserve (or 
interpret) the document attributes like encoding or standalone.  If you 
want to add those, you'd have to use instance.toDOM() and then use the 
DOM methods to modify the document.

Unless you have configured pyxb.utils.domutils.BindingDOMSupport (see 
http://pyxb.sourceforge.net/userref_usebind.html#creating-xml-documents-from-binding-instances), 
it generates a generic prefix for each namespace that is required, which 
is why each element has "ns1" as a prefix.  It also will not declare a 
default namespace unless you do something like:

  
pyxb.utils.domutils.BindingDOMSupport.SetDefaultNamespace(xml_types.Namespace)

Other than that, they look about the same to me.

 > 2) I have also some issues creating the same XML message using the Python
 > binding classes.
 >
 > object_one = object_types.Object('A', 'B', 'C')
 > object_two = object_types.Object('A', 'B', 'C')
 > my_objects = object_types.Objects(object_one, object_two)
 >
 > The problem is that I need to create dynamically a message of 10.000
 > objects. Taking this example, it means 10.000 variables, and 
definitely it
 > is not what I want.

I think what you're missing is that the internal elements are present as 
fields (actually, properties) of the containing object, and those 
elements which can appear multiple times are essentially Python lists.  
So you could just as well do:

        my_objects = Objects()
        my_objects.Object.append(ObjectType('A', 'B', 'C'))
        my_objects.Object.append(pyxb.BIND('A', 'B', 'C'))

or just extend the existing list value with multiple values at once:

        my_objects.Object.extend([ pyxb.BIND('A%d' % (_n,), 'B', 'C') 
for _n in range(0, 9) ])

This pattern could also have been used with the purchase order example:

  po.items.append(pyxb.BIND('Lapis necklace', 1, 99.95, partNum='833-AA'))
  po.items.append(pyxb.BIND('Plastic necklace', 4, 3.95, partNum='833-AB'))

Is that more like what you wanted to do?

Peter

Romain CHANU wrote:
> Hi,
>
> As I was saying in my previous post, I have some issues to create a 
> XML message with the binding classes.
>
> Let's take as an example this XML schema (just the important parts):
>
>   <xs:element name="Objects">
>     <xs:complexType>
>       <xs:sequence>
>         <xs:element name="Object" type="ObjectType" 
> maxOccurs="unbounded"/>
>       </xs:sequence>
>     </xs:complexType>
>   </xs:element>
>
>   <xs:complexType name="ObjectType">
>     <xs:sequence>
>       <xs:element name="A" type="xs:string"/>
>       <xs:element name="B" type="xs:string"/>
>       <xs:element name="C" type="xs:string"/>
>     </xs:sequence>
>   </xs:complexType>
>
>
> Then in my Python code (after generating the binding classes):
>
> import object_types
>
> object_one = object_types.Object('A', 'B', 'C')
> object_two = object_types.Object('A', 'B', 'C')
>
> my_objects = object_types.Objects(object_one, object_two)
> print my_objects.toxml()
>
>
> This is the only way I have found so far to create my XML message. The 
> problem is that I need to create dynamically a message of 10.000 
> objects. Taking this example, it means 10.000 variables, and 
> definitely it is not what I want.
>
> Could you tell me if there is another way to proceed?
>
> Thank you for your help.
>
> Romain Chanu
>
>
> PS:
>
> The same problem would appear in this example: 
> http://pyxb.sourceforge.net/userref_usebind.html#creating-instances-of-anonymous-types 
> with:
>
> po.items = pyxb.BIND(pyxb.BIND('Lapis necklace', 1, 99.95, 
> partNum='833-AA'),pyxb.BIND('Plastic necklace', 4, 3.95, 
> partNum='833-AB'))
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