[Tagging] Relation for saying "x is attached to y"?

Steve Bennett stevagewp at gmail.com
Mon Aug 30 10:06:34 BST 2010


On Mon, Aug 30, 2010 at 2:09 AM, Sebastian Klein
<bastikln at googlemail.com> wrote:
> Isn't it kind of obvious, that a "photovoltaic" type power generator is
> located on top of the building rather than inside or below?
>
> You may assume a basic level of intelligence from the user of the data and
> add only information that has more than one option. E.g. is the post box
> attached to a wall or does it stand on its own? In this example you would
> not need a relation, since the post box node can simply be joined with the
> building way.

"Assuming a basic level of intelligence" really harms machine reuse of
data. Even things that seem really obvious to a person can be complex,
tedious, and error-prone to code. Using relations and other tags to
make relationships very explicit makes reusing data much easier.

One example is bus stops. When a bus stop is near a way, it's
"obvious" to a person what that means - but pretty tricky for a
program to use for routing.

Steve



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