clearTopoGeom — Clears the content of a topo geometry.
topogeometry clearTopoGeom(topogeometry topogeom);
Clears the content a TopoGeometry turning it into an empty one. Mostly useful in conjunction with toTopoGeom to replace the shape of existing objects and any dependent object in higher hierarchical levels.
Availability: 2.1
-- Shrink all TopoGeometry polygons by 10 meters
UPDATE nei_topo SET topo = toTopoGeom(ST_Buffer(topo, -10), clearTopoGeom(topo), 0);