Re: [xml-dev] XML design of ((a and b) or c)

[Tei <oscar.vives@gmail.com>]

The MathML approach example:

<math xmlns="http://www.w3.org/1998/Math/MathML";>
  <apply>
    <and/>
    <ci>a</ci>
    <ci>b</ci>
  </apply>
</math>

http://www.zvon.org/xxl/MathML/Output/el_and.html

A assembler one:

push a
push b
and

<polaca>
 <push>a</push>
 <push>a</push>
 <and/>
</polaca>

It can be very fun:

(a and b) or c

<polaca>
 <push>a</push>
 <push>b</push>
 <and/>
 <push>c</push>
  <or/>
</polaca>

But I guest is a doomed approach because I dont think XML is
order-stable, so will make horrible things with a operation where
order matter :(


On 12/12/06, Mukul Gandhi <gandhi.mukul@gmail.com> wrote:
> The first approach looks good to me. But perhaps assigning a namespace
> to operator elements could be a good idea (something like below).
>
> <?xml version="1.0"?>
> <op:or xmlns:op="http://operator-ns";>
>    <op:and>
>       <a/>
>       <b/>
>    </op:and>
>    <c/>
> </op:or>
>
> On 12/12/06, Andrew Welch <andrew.j.welch@gmail.com> wrote:
> > 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
>
>
> --
> Regards,
> Mukul Gandhi
>