[DDI-SRG] "fixed" implementation question

[I-Lin Kuo]

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> 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] *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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