Hello! Does anybody know about a sample xml containing a RetWall? I found the description in the landxml 1.0 doc insufficient. The easiest way to understand the doc would be examining a sample, but if somebody could describe the meaning of the "offset" attribute, I would be happy too. The other thing I'm interested in is if there are corresponding points in the surface definition for the RetWallPnts, or not. Is a wall defined solely by a RetWall child of SourceData? If there are surface points too, are there two of them (one at the base of the wall, and one on the top), or just those, which are in the RetWallPoints (top or bottom, depending on the sign of the "heigth" attrib), or, as a third version, those points are not in the Pnts section, which are in the RetWallPnts, but their counterparts are (if the bottom is in the RetWallPnt, then the top is in the terrain definition)? I hope my questions are clear... Could anybody help? Thanks in advance, Greg