We are currently moving our clients to a 1.0-draft variant of the reconciliation specification, however, for our services to remain compatible with OpenRefine.org we will keep supporting 0.2 for the time being.
To achieve this we intend to make it so that our clients supporting 1.0-draft will explicitly ask for that version. This means that to support OpenRefine.org our default will need to be 0.2 although we will consider that version the legacy one. This could however, be much improved if version negotiation would become a part of the specification and later supported in OpenRefine.org.
Because of this I would like to draw some attention towards the following issue regarding version negotiation in reconciliation services, with the hope that others are interested in moving this particular issue forward: