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RE: XML design of ((a and b) or c)

  • From: "Michael Kay" <mike@s...>
  • To: "'Andrew Welch'" <andrew.j.welch@g...>,<xml-dev@l...>
  • Date: Tue, 12 Dec 2006 15:57:25 -0000

RE:  XML design of ((a and b) or c)
The first one seems much the cleanest.

Michael Kay

> -----Original Message-----
> From: Andrew Welch [mailto:andrew.j.welch@g...] 
> Sent: 12 December 2006 15:23
> To: xml-dev@l...
> Subject:  XML design of ((a and b) or c)
> I've just had to design some XML to model items that can have "and"
> and "or" relationships between each one.
> For example:
> (a and b) or c
> could be designed as:
> <or>
>     <a>
>     <and>
>         <b/>
>         <c/>
>     </and>
> </or>
> another option could be to rely on position:
> <a>
> <and/>
> <b/>
> <or/>
> <c/>
> and another could be model the relationships separately somehow:
> <relationships>
>   <rel ref="r1" type="and">
>     <ent id="a"/>
>     <ent id="b"/>
>   </rel>
>   <rel ref="r2" type="or">
>     <ent id="r1"/>
>     <ent id="c"/>
>   </rel>
> </relationships>
> <a id="a"/>
> <b id="b"/>
> <c id="c"/>
> Each has its own advantages/drawbacks.  Personally I like the 
> first technique, although it can get cluttered when there are 
> 10+ items.
> Are there any better ways that I'm missing?
> cheers
> andrew
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