[Tagging] Data redundancy with "ref" tag on ways vs relations

[Kytömaa Lauri]

 Petr Morávek [Xificurk] wrote:
>2) A relation exists with member ways without ref tag. This means that
>the route is essentially mapped and any further editor is correcting
>errors, that he found. Then someone comes and adds a ref tag to one of
>the ways - why?

He drove by, and saw a different ref sign next 
to that road from one intersection and the next
one. He has no knowledge of where the ref on
the relation comes from, and if it is still valid on
all the ways currently part of the relation. He
only knows that this way has a ref=new value,
and it's all he can enter. Locals will eventually
notice, and resurvey the whole area - they'd
have to resurvey anyway.

-- 
Alv