& XSLT 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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