<P> In cognitive development for walk and for catch objects, or for understand objects - behaviour; in robotic Natural Features Navigation; and many other areas, spatial relations plays a central role . </P> <P> Commonly used types of spatial relations are: topological, directional and distance relations . </P> <Dl> <Dd> Main article DE-9IM . </Dd> </Dl> <Dd> Main article DE-9IM . </Dd>

What type of spatial relationships can be captured by topology