datafacer Geom {

    // Services divers
	service list[Coordinate] getCoordinates();
	service list[list[Coordinate]] getMultiCoordinates();
	service boolean isMultiGeom();
	service boolean isPoint();
	service boolean isLine();
	service boolean isPolygon();

        // 0=point,1=line,2=polygon,10=multipoint,11=multiline,12=multipolygon 
	service int geomType();

    // Services de tests geometriques
	service boolean contains(Geom g);
	service boolean coveredBy(Geom g);
	service boolean covers(Geom g);
	service boolean crosses(Geom g);
	service boolean disjoint(Geom g);
	service boolean equals(Geom g, real tolerance);
	service boolean intersects(Geom g);
	service boolean overlaps(Geom g);
	service boolean touches(Geom g);
	service boolean within(Geom g);

    // Service de mesures
	service real area();
	service real distance(Geom g);
	service real length();


    // Services de construction et calculs de nouvelles geometries
	service Geom createPoint(Coordinate c);
	service Geom createLine(list[Coordinate] lc);
	service Geom createPolygon(list[Coordinate] lc);
	service Geom createMultiPoint(list[Coordinate] lc);
	service Geom createMultiLine(list[list[Coordinate]] llc);
	service Geom createMultiPolygon(list[list[Coordinate]] llc);
	service Geom buffer(real distance);
	service Geom centroid();
	service Geom convexHull();
	service Geom difference(Geom g);
	service Geom intersection(Geom g);
	service Geom union(Geom g);
}

datafacer Coordinate {
   	service real getX();
   	service real getY();
   	service real getZ();
   	service setX(real x);
   	service setY(real y);
	service setZ(real z);
	service move(real dx, real dy, real dz);
}