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Motivation
The Accept header enables negotiation of major MIME types but does not cover MIME type extensions.
In particular XML heavily uses extensions.
XML namespaces.
Example: PIDF (application/pidf+xml).
PIDF-LO enables the inclusion of location objects in PIDF.
PIDF-LO supports the use of different location object formats (Civil Location Format, GML 3.0, …).
Proposal: new parameter for Accept header.
Extends semantics of Accept header to language extensions.
PPT Version