& XSLT The first one seems much the cleanest.

Michael Kay
http://www.saxonica.com/
 

>  -----Original Message-----
>  From: Andrew Welch [mailto:andrew.j.welch@[...].com] 
>  Sent: 12 December 2006 15:23
>  To: xml-dev@[...].org
>  Subject: [xml-dev] 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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