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   Re: [xml-dev] typing with XML Schema

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Thanks for your reply. I am aware of this technique but was hoping for 
something just a tad more elegant. The method described in the primer 
works and works well, but something along the lines of what I tried 
seems just a tad more elegant since it frees the XML Schema writer from 
having to manually type in the numeric maximum value (although one could 
argue it doesn't free the XML Document writer from having to know what 
the maximum value is (but isn't that what a validator for?)). In any 
case, I will proceed using the method I have been using already (the one 
you kindly suggested). Thanks again.

HK Chan

Chiusano Joseph wrote:
>>-----Original Message-----
>>From: Ho-Kuo Chan [mailto:hchan@wavesat.com] 
>>Sent: Friday, February 04, 2005 9:33 AM
>>To: xml-dev@lists.xml.org
>>Subject: [xml-dev] typing with XML Schema
>>I'm not sure if this is the correct forum for my question, 
>>forgive me if it is not and feel free to point me in the 
>>correct direction for it. 
>>What I would like to do is create a new simpleType that is 
>>identical to a built-in type, without any restrictions. 
>>Consider an example from C
>>typedef uint16_t my_element_type;
>>What's the point? Well doing this allows me to use the 
>>everywhere and if it's size ever changes from say the 16 bits 
>>defined to say 32 bits, I can just replace the line above with:
>>typedef uint32_t my_element_type
>>and the update becomes automatic throughout.
>>I thought something like this would have been perfect but is iilegal:
>><xsd:simpleType name="my_element_type" base="xsd:unsignedShort"/>
>>then I tried this:
>><xsd:simpleType name="my_element_type">
>>    <xsd:restriction base="xsd:unsignedShort"/> </xsd:simpleType>
>>but it too is illegal.
> I recommend that you reference the W3C Schema Primer[1] for an example
> of this - see section "2.1 The Purchase Order Schema", specifically
> "<xsd:element name="quantity">".
> Hope that helps.
> Kind Regards,
> Joseph Chiusano
> Booz Allen Hamilton
> Strategy and Technology Consultants to the World
> [1] http://www.w3.org/TR/2001/REC-xmlschema-0-20010502/ 
>>Is there an elegant way to do this? Thanks in advance!
>>HK Chan


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