Hi Markus,

> I wrote some extension in Mapbuilder (even if it is not complete  
> and needs to be refactored)
> to render a collection of TimeSlices.

Further to your email I'd appreciate your thoughts on using a track/ 
MovingObjectStatus as opposed to history/_Timeslice. As I understand  
it timeslices allow you to express just what has changed since the  
last timeslice - I can see that being very useful for some WFS  
queries. However MovingObjectStatus specifies a concrete set of  
elements for features that move including bearing, elevation,  
location etc for a given validTime. Given this higher level structure  
would MovingObjectStatus be more appropriate for your scenario of  
tracking moving buses?

Kind regards,
Christopher

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