Re: [openstreetmap/openstreetmap-website] XML generation: nodes, ways, relations, map controller → view (#2223)

[Tom Hughes]

Sure I understand what `||` is and what that expression is doing and how you would use it in an ERB template - what I'd like to understand is what it does in builder though.

I did try to look last night but the builder doco wasn't working - will try again.

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