[Talk-GB] Schools

Colin Smale colin.smale at xs4all.nl
Fri Aug 5 12:41:06 UTC 2016


On 2016-08-05 14:17, Dave F wrote:

> On 05/08/2016 12:11, Colin Smale wrote: 
> 
>> On the other hand, consumers will have to deal with the MP model anyway, so having multiple models for the same thing is actually adding to the complexity.
> 
> MP's were never conceived as a blanket 'cover all' solution.
> "I did it for a couple of schools, so I thought I'd do it for the rest of them" is not a valid tagging technique.

What I meant was, having established that some (many?) schools will need
to use the MP model, all consumers (for this data) will need to be ready
to process MPs anyway. A single polygon consisting of a single way is
just a degenerate case of an MP. Modelling all of them as an MP saves an
"if" statement and a second set of logic to process the data. 

The single, closed way and the trivial MP containing such a way are
entirely semantically equivalent. There is no need to have two ways of
representing exactly the same information. 

//colin
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