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The most popular track format for GPS tracks is GPX (GPS eXchange Format)
based on XML. It usually contains separate tracks divided into segments.
The same structure is used in GPS Track Editor since GPX is its native
format. To avoid confusion, the following terminology is used in the
application:
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Track edge is a line between two adjacent track points.
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Track segment represents a continuous span of track data.
A segment is usually broken when the GPS reception was lost,
or the GPS receiver was turned off.
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Track folder combine several sequential track segments that are
logically connected with each other. For example a folder can correspond
to a trip or a one day's journey.
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Track file consists of track folders and corresponds to a file.
Track can represent any of those elements. It designates a segment,
a folder, or a file.
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