// Example 2: Check type of geometry to make sure a point is retrieved before attempting conversion
f is Geometry 
// Get geometry ...
// Check geometry
IF f.Type = gtPoint2D THEN
   my2DPoint is Point2D
   my2DPoint = f
   //...
END

// Example 3: The type of a geometry can be changed
point is Point2D
linestring is Linestring2D
f is Geometry // Geometry is empty and can take any type of geometry
f = point // Geometry now contains a Point2D object.
f = linestring // Geometry now contains a Linestring2D object.

// Example 4: Get a geographic polygon without verification
// No need to declare an intermediate geometry 
// Directly convert the result of a function
f = GetGeometry() // GetGeometry is a procedure used to get a geometry
IF f.Type = gtPolygonGeo THEN
   polygon is PolygonGeo
   polygon = f
   // ...
END

// Example 5: If the type of geometry retrieved is unknown,
// different code can be executed according to the type of geometry
UnknownGeometry is Geometry
UnknownGeometry = GetUnknownGeometry() 
// GetUnknownGeometry is a procedure used to get a geometry
SWITCH UnknownGeometry.Type 
	CASE gtPoint2D:
	       // ...
	CASE gtLinestring2D:
	       // ...
	CASE gtPolygon2D:
	       // ...
	OTHER CASE:
	       // ...
END