A site is a collection of objects that are topologically related. The object types that can be included in a site are feature lines, parcel lot lines, and alignments. A key point to remember is that when objects in the same site intersect, they acquire the same elevation at the crossing point, similar to crossing breaklines in a surface. You can create overlapping objects that do not interact this way, by simply assigning them to different sites. The following sections describe some of the interaction of objects within a site.