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RFC 6690, "Constrained RESTful Environments (CoRE) Link Format", August 2012

Source of RFC: core (app)

Errata ID: 5254
Status: Reported
Type: Technical
Publication Format(s) : TEXT

Reported By: David Mosberger
Date Reported: 2018-02-03

Section 2 says:

relation-types = relation-type
                   / DQUOTE relation-type *( 1*SP relation-type ) DQUOTE

It should say:

relation-types = reg-rel-type
               / DQUOTE relation-type *( 1*SP relation-type ) DQUOTE


As defined originally "relation-types" may consist of a "URI". RFC 3986 defines URI to allow semi-colons in various places. For example, "http://;" seems to be a valid URI. Unfortunately, that makes parsing a link-param list ambiguous since its elements are separated by semicolons.

The proposed fix to to allow "ext-rel-type" (i.e., "URI") to appear only inside a quoted relation-type list.

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