Andrew,
The first approach looks best and is the one that would be obvious to a
lisp programmer, where this would be:
(or a (and b c))
This scales well for multiple arguments and for different functions. Go
for it!
Robin
Andrew Welch 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
>
> _______________________________________________________________________
>
> XML-DEV is a publicly archived, unmoderated list hosted by OASIS
> to support XML implementation and development. To minimize
> spam in the archives, you must subscribe before posting.
>
> [Un]Subscribe/change address: http://www.oasis-open.org/mlmanage/
> Or unsubscribe:
> subscribe:
> List archive: http://lists.xml.org/archives/xml-dev/
> List Guidelines: http://www.oasis-open.org/maillists/guidelines.php
>
--
-- ---------------------------------------------------
Robin La Fontaine DeltaXML: "Change control for XML"
Email: http://www.deltaxml.com
Free XML comparison service http://compare.deltaxml.com
