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Hi Folks,
Let's suppose that unitsofmeasure are represented as properties, e.g,
<River id="Yangtze">
<length>
<kilometer>6300</kilometer>
</length>
</River>
Here is an example where the length of the Yangtze River is described
using a mile property:
<River id="Yangtze">
<length>
<mile>3914</mile>
</length>
</River>
It would be very useful to be able to state the relationship between the
kilometer and mile properties. For example, suppose that I wish to
define the kilometer property:
<Property id="kilometer">
...
</Property>
When I define this property it would be very useful to express that this
property is related to the mile property, e.g.,
<Property id="kilometer">
"This property is related to the mile property. Namely,
if the value of a mile property is multiplied by 1.62
and it yields a value that is equal to the value of this
property, then the two properties are said to represent
the same distance."
</Property>
Do you have any suggestions on how to syntactically represent this
relationship statement?
Here is a more complex example, showing a map location using two
different coordinate systems:
<Map id="M1">
<location>
<cartesiancoordinate>
<x>
<kilometer>100</kilometer>
</x>
<y>
<kilometer>100</kilometer>
</y>
</cartesiancoordinate>
</location>
</Map>
<Map id="M21">
<location>
<polarcoordinate>
<r>
<kilometer>141.421</kilometer>
</r>
<theta>
<radian>0.7341</radian>
</theta>
</polarcoordinate>
</location>
</Map>
It would be very useful to be able to state the relationship between
these coordinate systems, e.g.,
<Property id="cartesiancoordinate">
"This property is related to the polarcoordinate
property. Namely, if these equations are satisfied:
x = r sin theta
y = r cos theta
then the two properties are said to represent the same
location."
</Property>
(For the moment let's ignore the conditions that Alaric noted yesterday)
Do you have any suggestions on how to syntactically represent this
relationship?
/Roger
