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Re: What are the characteristics of a good type system for XML

• To: xml-dev@l...
• Subject: Re: What are the characteristics of a good type system for XML?
• From: james anderson <james.anderson@s...>
• Date: Wed, 14 May 2003 17:29:21 +0200
• Organization: nil
• References: <44.3113fcc7.2bf15bc1@a...> <20030512233607.78fa7d97.amyzing@t...> <2d3901c31909$e95f8fe0$1401a8c0@snobird> <20030513154522.GA25314@t...> <2e1301c3198b$fccf2bd0$1401a8c0@snobird> <20030513211908.5e9d637f.amyzing@t...> <132-1264834486.20030514104155@j...> <02b601c31a1c$a6216a00$4bc8a8c0@A...>
• Reply-to: james.anderson@s...

?
is there any need to introduce the indirection through a prefix? wouldn't

 <zref idref="{some uri}a1"/>

be adequate? do you really need the benefit of the scoped bindings?

Rick Jelliffe wrote:
> 
> 
> IDs are one end of the non-tree structure in an XML document,
> a target for links.  So perhaps they don't have enough scope:
> perhaps documents should be given "keyscopes" which allows
> elements with IDs from one document to be pasted into another.
> Here is a mechanism, rather like the dreaded namespaces (no
> flames please), to demonstrate what I mean:
> 
> <x>
>     <y keyscope="some uri">
>         <z id="a1" />
>         <zref idref="a1"/>
>     </y>
>     <y keyscope="some other uri">
>         <z id="a1" />
>         <zref idref="a1"/>
>         <zref idref="aa:a1"  keyscope:aa="some uri"/>
>     </y>
> </x>
> 
> In other words, instead of (or as well as) the typing focus of
> what elements can be pointed by another element (i.e. the
> kinds of concerns that keys raise) perhaps we need to consider
> the modularity/document composition concern of how to
> allow cut and paste between documents without having to reallocate
> IDs.  So that IDs are universally unique.
> 
> What might a suitable keyscope URI be? Well, initially it can be
> the original document that the data was cut and pasted from.
> This brings us to a kind of transclusion: we keep track of the
> source of the fragment.

please don't do this. please just admit that id values are universal names and
serialize them as such.

> 
> <x>
>     <y keyscope=" http://www.eg.com/somedocument.xml ">
>         <z id="a1" />
>         <zref idref="a1"/>
>     </y>
>     <y>
>         <z id="a1" />
>         <zref idref="a1"/>
>         <zref idref="aa:a1"  keyscope:aa=" http://www.eg.com/somedocument.xml "/>
>     </y>
> </x>
> 
> where some smart software could figure out that there was some equivalence between
> <zref idref="aa:a1"  keyscope:aa=" http://www.eg.com/somedocument.xml "/>
> and
>  <zref xlink:href="http://www.eg.com/somedocument.xml#a1 "/>
>

• Follow-Ups:
  • Re: What are the characteristics of a good type system for XML?
    • From: Arjun Ray <aray@n...>

• References:
  • What are the characteristics of a good type system for XML?
    • From: AndrewWatt2000@a...
  • Re: What are the characteristics of a good type systemfor XML?
    • From: Amelia A.Lewis <amyzing@t...>
  • Re: What are the characteristics of a good type system for XML?
    • From: "Bob Foster" <bob@o...>
  • Re: What are the characteristics of a good type system for XML?
    • From: Amelia A Lewis <amyzing@t...>
  • Re: What are the characteristics of a good type system for XML?
    • From: "Bob Foster" <bob@o...>
  • Re: What are the characteristics of a good type systemfor XML?
    • From: Amelia A.Lewis <amyzing@t...>
  • Re: What are the characteristics of a good type system for XML?
    • From: Jeni Tennison <jeni@j...>
  • Re: What are the characteristics of a good type system for XML?
    • From: "Rick Jelliffe" <ricko@a...>

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