[Openstreetmap] Extending GPX to include track type information?

[Lars Luthman]

On Sun, 2005-03-20 at 13:47 +0000, Nick Whitelegg wrote:
> The problem is GPX does not allow specification of track segment types. I'm 
> getting round this by using GPX's ability to add extensions within the 
> <extensions> tag, and adding a table of segment types, and start and end 
> trackpoints, within the extensions  tag i.e.
> 
> <extensions>
> 
> <!-- This segment starts at track point 3, ends at track point 7, and has type 
> 1 (my current type definition for footpath though could be changed to a more 
> textual form as per the other thread... -->
> 
> <segdef>
> <start>3</start>
> <end>7</end>
> <type>1</type>
> </segdef>
> 
> <segdef>
> ....
> etc
> 
> This works (and could be easily extended to multiple tracks in the same GPX 
> file) but is maybe a tad clunky. I want to keep GPX (rather than a more 
> complex format) as it's simple and lightweight but just wondering what 
> others' approaches would be?

Do you really need the different types to be in the same track? If you
split them into multiple tracks you already have a <type> element for
tracks in the GPX specification.

Also, the <start> and <end> tags are a bit confusing - why are they
needed? Are your track segments different from the trksegs defined in
GPX?

-- 
Lars Luthman
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