Re: [xml-dev] DTD vs XSD: No Duplicate Types in (Mixed) Content Models

[=?UTF-8?B?TWFpayBTdMO8aHJlbmJlcmc=?= <maik.stuehrenberg@uni-bielefeld.de>]

Hello Mukul,

thank you very much, that was one of the answers I was searching for. I 
didn't realize that there is a difference between particles and element 
types (names) -- but of course it makes sense when reading the unique 
_particle_ attribution.

And thanks for the Xerces hint as well.

Regards,

Maik

Am 31.01.11 16:27, schrieb Mukul Gandhi:
> Hi Maik,
>      In the example you've cited below, in the first case the schema
> defines 5 particles (the 5 element particles) while in the 2nd case
> the schema defines only one particle (but whose cardinality is>  1,
> and that is a deterministic schema to validate an XML instance
> document).
>
> If the XML document fragment was following, for example:
> <b/>
> <b/>
> <b/>
> <b/>
>
> and if this was attempted to be validated by the Schema sequence
> defined in your first case, then we should get a UPA violation (since
> the XML Schema validator cannot determine that with which element
> particle, the instance element should be validated).
>
> As a side note: I think Xerces has an option to turn off UPA checking,
> so you can perform a lax validation ignoring UPA concerns.
>
> On Mon, Jan 31, 2011 at 7:57 PM, Maik Stührenberg
> <maik.stuehrenberg@uni-bielefeld.de>  wrote:
>> It would be interesting to know why XSD processors do make a difference
>> between
>>
>> <xs:element name="a">
>>     <xs:complexType>
>>       <xs:sequence>
>>         <xs:element ref="b"/>
>>         <xs:element ref="b"/>
>>         <xs:element ref="b"/>
>>         <xs:element ref="b" minOccurs="0" maxOccurs="1"/>
>>         <xs:element ref="b" minOccurs="0" maxOccurs="1"/>
>>       </xs:sequence>
>>     </xs:complexType>
>>   </xs:element>
>>
>> and
>>
>> <xs:element name="a">
>>     <xs:complexType>
>>       <xs:sequence>
>>         <xs:element ref="b" minOccurs="3" maxOccurs="5"/>
>>       </xs:sequence>
>>     </xs:complexType>
>>   </xs:element>
>
>
>
>

-- 

Maik Stührenberg, M.A.

Universität Bielefeld
Fakultät für Linguistik und Literaturwissenschaft
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33615 Bielefeld

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