El Jueves, 22 de Enero de 2009, David Earl escribió: > I know I'm likely to hear wildly contradictory answers and > there's probably no right answer.
Here's mine: You should tag things with a new layer= tag whenever thy form a different surface. Think of the earth as a big (pseudo-)spherical surface. That's layer 0. Now put a bridge anywhere. You can either stand on the earth surface, under the bridge (layer 0), or on the bridge, over the earth surface. Technically, another layer exists whenever it would be possible for a physical, inanimated, heavy object to freely stand at the same set of latitude-longitude coordinates, but at different elevations. So, about the ramps in your theoretical bridge... are they supported on a few tons of dirt, or on top of concrete pillars? -- ---------------------------------- Iván Sánchez Ortega <i...@sanchezortega.es> MSN:i_eat_s_p_a_m_for_breakf...@hotmail.com Jabber:ivansanc...@jabber.org ; ivansanc...@kdetalk.net
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