I am trying to construct my own implementation of an itinerary buffer
- to locate POIs in close proximity to an itinerary.

Each Step contains a number of segments along the itinerary within its
path.
What I would like to know is
1. is there a rule defining a 'step' ?
2. is there a rule which will define how far from the direct line
(start point - end point) the itinerary is permitted to deviate (eg 1
km, 1 mile) ?

One last thing .... does anyone have access to an open source
implementation of a buffering algorithm in either PHP or Javascript
that they could share with me - this thing is not simple !

Oh, you ask why on earth am I doing this when product X comes with
it ?
I don't have access to product X (Postgres with PostGIS / MySql with
the extenstions from Alexey Botchkov / etc).

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