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Re: Re: An approach to describing the relationships betweenuni

thread tolerance

Roger L. Costello wrote:

> The next issue is: how do we syntactically specify the formula
> for the canonical form for each UOM?  A simple approach is this:
> <Property id="kilometer">
>     <canonicalForm>$value * 1000</canonicalForm>
> </Property>

* Where does it say here that the base UOM of kilometer is the meter? 
Without this info, the expression in the canonicalForm tag is useless ;-)

* The expression would be much more usefull if it could be handled by an 
XML API and not some other parser.

I don't think a mapping to a "canonical UOM" is needed, unless you 
intend to use it as a standard route to "infer" missing formulas. Anyway:

<Property id="kilometer">

<formulaBetweenUOM id="kilometerToMeter">
    <mapping UOM-pointer="kilometer" number="1"/>
    <mapping UOM-pointer="meter" number="1000"/>

I believe it would be better to seperate formulas from units and upgrade 
them to classes. Those can be usefull to infer other formulas by finding 
a route in the graph, also taking "number" into account. Tolerance can 
be left up to the implementation...

Manos Batsis

Netsmart S.A.

Snail mail:
Panepistimiou 58,
10678, Athens, Hellas

URL:    http://www.netsmart.gr
Email:  mbatsis at netsmart dot gr
Tel:    (+30) 210 33 02 608
Fax:    (+30) 210 33 02 658
FOAF:   http://forte.netsmart.gr/foaf/manos_foaf.rdf


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