Gerd, It is mentioned in the wiki, see table under road signs, #8 Used for not one-way roads, where entering across some point (member node with role via) is prohibited. Relation can have several from members[2] and one to member. We have used this relation because it is not a oneway street so oneway does not apply. You are only not allowed to drive in this street from this side. In the NL's there are a lot of situations like this, mainly residential streets with a no car traffic sign only on one entry side of the street. On a lot of maps and osm it is falsely mapped as one way (+ cycleway=opposite). But on the other hand I understand this will ever be mapped with turn restrictions, that is way too complicated. A workaround is to map only a small beginning as oneway:motorcar=yes or -1 depending on the street direction.
sorry, Thorsten already said that no_entry is not supported (and it doesn't appear in the wiki) See also http://wiki.openstreetmap.org/wiki/Relation:restriction
Gerd