(recode.info)New surfaces

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Adding new surfaces
===================

   Adding a new surface is technically quite similar to adding a new
charset.  Note: New charsets.  A surface is provided as a set of two
transformations: one from the predefined special charset `data' or
`tree' to the new surface, meant to apply the surface, the other from
the new surface to the predefined special charset `data' or `tree',
meant to remove the surface.

   Internally in `recode', function `declare_step' especially
recognises when a charset is so related to `data' or `tree', and then
takes appropriate actions so that charset gets indeed installed as a
surface.


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