Can a closed way be included in two separate relations?

General talk
1

I’ve noticed one particular closed way, which is included in two different relations.
This one:
http://www.openstreetmap.org/relation/2706063

And this one:
http://www.openstreetmap.org/relation/2706065

In the first relation it represents an inner building area.

But what is the purpose of that second relation (2706065)?

2

Second one, with only a type=multipolygon and no other tagging is a mistake of some sort. Don’t know if it was ignorance or the particular editor the person was using. The item has only one version and it was done a number of years ago.

3

While it might be wrong in this case, in general it is possible that a closed way is part of 2 relations.
Imaging a lake on an island completely covered by a wood in a lake.
The outer lake is a relation with 2 ways LAKE (as outer) and ISLAND (as inner)
The wood would then be a second relation with that same ISLAND (now as outer) and the smallest lake as inner way.

This is also explained with images on https://wiki.openstreetmap.org/wiki/Relation:multipolygon

4

Thank you for the clear explanations both n76 and escada!