Do relations of type=multipolygon have to have at least one way with role=outer?

General talk Tagging general discussion
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Specifically, is this relation malformed?

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The wiki says multipolygon relations need at least one or more outer members and zero or more inner members. And says to not leave the role member empty: Tools may handle this as Role outer or will attempt to guess the effective role from the geometry using a slow/complex algorithm, and may fail.

So to reply the question in the title: yes.

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Thanks, just checking before making edits.

There are a few in the area I’ve been looking at. e.g.: overpass turbo

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Looking at it I wonder if it shouldn’t be a multilinestring

This relation type is used when a single physical object would qualify as a multipolygon, except that it covers no area because it consists of linear features (unclosed ways).

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On a second look I would not make it a relation anyway. It is just a “collection” of barriers (kerb) which should only be nodes or ways

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