[xsd-users] Mpeg-7 schema support? Problem:

[Mattis Fjallstrom]

Hi Boris,

Thank you. I understand the problem much better now. I'm still surprised 
that the mpeg-7 schema would have a problem like this ... it is supposed 
to be some sort of standard, after all. :-) I'll see if I can find an 
email address to ask an expert on mpeg-7 as well. If I find something, 
I'll let you know.

Cheers,

Mattis



Boris Kolpackov wrote:
> Hi Mattis,
> 
> On Tue, Nov 07, 2006 at 07:14:07PM -0800, Mattis Fjallstrom wrote:
> 
>> bash:~/downloads/Mpeg-7 Schema Files$ xsd cxx-tree Mpeg7-2001.xsd
>> :0:0: error: Complex type 'ShotEditingTemporalDecompositionType' violates
>> the Unique Particle Attribution rule in its components
>> 'CompositionTransition' and 'CompositionTransition'
>>
>> ---
>>
>> So ... two questions, I guess - has anyone made XSD parse Mpeg-7 schemas?
>> And second, does anyone know what this error really means?
> 
> The error says that the schema violates the Unique Particle Attribution
> rule (UPA for short). The UPA rule requires that there is only one way
> to associate, e.g., an element in an XML instance to an element
> declaration in a schema. For instance, consider the following XML Schema
> fragment:
> 
> <sequence>
>   <element name="foo" type="string" minOccurs="0"/>
>   <element name="foo" type="string" maxOccurs="unbounded"/>
> </sequence>
> 
> And this instance:
> 
> <foo>foo</foo>
> <foo>bar</foo>
> 
> Here the parser can associate both elements to the second declaration
> in the schema or it can associate the first element to the first
> declaration (the one with minOccurs="0") and the second element to the 
> second declaration. Thus this schema violates the UPA rule.
> 
> I won't be able to try your schema with XSD until Monday. I will let you
> know about my results.
> 
> hth,
> -boris
> 
>