[DDI-SRG] "fixed" implementation question

[Pascal Heus]

I-Lin:
I saw and discussed the new Identifier design before. I don't think it 
should be a problem to have the attribute optional (fixed). I agree with 
J that  we usually know what to expect.
*P

I-Lin Kuo wrote:
> I don't think javascript is schema-aware but I imagine these 
> attributes would be of interest to DexTris. Pascal, chime in?
>
> On Dec 5, 2007 3:35 PM, J Gager < j.b.gager at gmail.com 
> <mailto:j.b.gager at gmail.com>> wrote:
>
>     It is my opion that anything that would want to know this
>     information would probably be schema aware. I can't imagine
>     something that is complex enough to care wheter an individulal
>     artefacts are maintainable or versionable not validating the XML
>     first.
>      
>     We have used fixed attributes in numerous XML implementations and
>     it has never come up as an issue.
>      
>     The DDI is very complex, and secondary validation is most likely
>     required for any useful application. I don't think creating the
>     standard against the lowest level of tools is the right design
>     decision.
>      
>     But that is just my 2 cents.
>      
>     J
>
>     ------------------------------------------------------------------------
>     *From:* ddi-srg-bounces at icpsr.umich.edu
>     <mailto:ddi-srg-bounces at icpsr.umich.edu>
>     [mailto:ddi-srg-bounces at icpsr.umich.edu
>     <mailto:ddi-srg-bounces at icpsr.umich.edu>] *On Behalf Of *I-Lin Kuo
>     *Sent:* Wednesday, December 05, 2007 4:12 PM
>     *To:* DDI Technical Implementation Committee
>     *Subject:* [DDI-SRG] "fixed" implementation question
>
>     HI all,
>
>     In Wendy's TIC report email, I saw a couple of lines using fixed,
>     e.g. "@isMaintainable fixed="true"".
>
>     I just want to check that it's not being implemented in the
>     obvious way,
>
>     <xs:attribute name="isMaintainable " type="xs:string" fixed="true"/>
>
>     Implementing it this way would be a very bad idea, in my opinion.
>     Implemented this way, the @isMaintainable may be omitted in an
>     instance document and yet validate against the schema. When this
>     instance is processed, the attribute isMaintainable is visible
>     only when you are processing in a schema-aware fashion. Most XSLT
>     engines and streaming processors are not schema aware. The end
>     result is that the results of applying an XSLT stylesheet to an
>     instance will differ, depending on whether the stylesheet is run
>     with a schema-aware processor or an unaware processor.
>
>     I recommend the following implementation:
>
>     <xs:attribute name="isMaintainable " type="ddi:fixed" required="true"/>
>
>     where ddi:fixed is defined to be "true", restricting xs:string.
>
>     -- 
>     I-Lin Kuo
>
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>
>
>
> -- 
> I-Lin Kuo
> ------------------------------------------------------------------------
>
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