[Tagging] How to tag a fence made with metal bars?

[Gonzalo Gabriel Pérez]

Hi everyone,
I'm reading in the wiki ( http://wiki.openstreetmap.org/wiki/Key:fence_type
) about the fence_type key and I think that it ambiguous the way that is
described how could be tagged a fence made with metal bars like these, see
pictures:

http://www.puertasblindalock.com.ar/images/reja-de-seguridad-2.jpg

http://4.bp.blogspot.com/_3mO9j6PCOQc/S3lYvlCmEaI/AAAAAAAAAAM/uBmMExArTnI/S660/35150559_1.jpg

http://www.elforjador.cl/img/galeria/el_forjador_reja_3.jpg

Which values between 'bars', 'wire' and 'metal' should be used?

Maybe we need to modify the wiki article to make it more precise?

Greetings,
Gonzalo (Zalitoar)
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