Re: [xml-dev] Selective restriction for attributes based on elementvalue

[Nagesh Subrahmanyam <nageshblore@gmail.com>]

Hi Dennis,
No, I am able to define restrictions in other cases. However, my 
requirement is to apply restrictions on the attribute based on the value 
of the element. Consider the example I have pasted here. When the value 
of the <startTag> is op1 the attribute value must be alphabetic. When 
the value of the <startTag> is op2 it must be numeric.

How do I this ?

I am thinking of a "less-heroic" option now. That is, designing my xsd 
such that, the tags are created by what is currently the values of 
<startTag> (the list of values is known and finite) and then use 
attributes (currently) as the values of the tags. Like so,

<op1>x</op1> and <op2>0</op2>

Regards,
Nags.

Dennis Sterzenbach wrote:
> Hello Nagesh,
>
> Nagesh Subrahmanyam wrote:
>   
>> I have an element <startTag> with attribute as type. The value of the
>> attribute type can be numeric or alphabetic (with or without limits
>> and/or patterns) depending on what was the value of the element. The
>> value of the element would be string always. How do I apply such a
>> restriction for the attribute ?
>>
>> Examples :
>>   <startTag type="x">op1</startTag>
>>   <startTag type="0">op2</startTag>
>>
>> Regards,
>> Nags.
>>     
>
> I suggest you want to know, how to define the restriction for some XSD
> Schema? As far as I know for that case you have to define your own type,
> which might look like this (untested):
>
>   <xs:simpleType name="myRestrictedType">
>     <xs:restriction base="xs:string">
>       <xs:pattern value="([a-zA-Z]|[0-9])"/>
>     </xs:restriction>
>   </xs:simpleType>
>
> and reference from your attribute declaration:
>
>   <xs:attribute name="type" type="myRestrictedType" use="required" />
>
> Hope that helps!
> -- Dennis Sterzenbach
>
>