Quote - I always thought, that Poser would repeat the texture from the 0..1 range.

The variety of tiling (if any) is also controlled by the image node, so when using an image, and you have Tiling set to something other than None, the image will be wrapped/scaled/offset according to the other settings on the node.
In this situation the node itself collapses the UVs into 0..1 Procedurals can make use of what ever numbers have been assigned, i.e. Poser doesn't collapse them to 0..1 before outputting them from a U or V node.