Jan Wieck <janwi...@yahoo.com> wrote: > Does ['15:15:00','15:15:00') make any more sense? Doesn't this > essentially mean > > >= '15:15:00' && < '15:15:00' > > which again doesn't include a single point on the time line? It defines a position in time with zero duration. Some of the graphics programming I've done in the past was based on a system where, at the pixel level, the coordinates referred to the boundaries *between* the pixels. If you were to have a number of horizontal bars, for example, the size of which you would adjust to represent fluctuating data, you might have an x coordinate of 20 for the left edge, and [20,30) would paint 10 pixels. I guess you *could* destroy and recreate the object when the number dropped to zero and came off it again; but the concept of [20,20) to draw zero pixels but maintain the positional anchor can be convenient. I see parallel concepts for some data domains in a database. -Kevin
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