Describing the relationships between units-of-measure?
Hi Folks, Let's suppose that units-of-measure 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> <cartesian-coordinate> <x> <kilometer>100</kilometer> </x> <y> <kilometer>100</kilometer> </y> </cartesian-coordinate> </location> </Map> <Map id="M21"> <location> <polar-coordinate> <r> <kilometer>141.421</kilometer> </r> <theta> <radian>0.7341</radian> </theta> </polar-coordinate> </location> </Map> It would be very useful to be able to state the relationship between these coordinate systems, e.g., <Property id="cartesian-coordinate"> "This property is related to the polar-coordinate 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
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