Merge FairSync and InCommon or make it interoperable

In the D-A-CH-Region there is a Fairmove-IT-Movement working to connect the most relevant platforms of change like

We decided to start as a centralized system (over openfairDB) to get it running, but want to be federated as soon as possible.

We will browse this forum and your documentation to see how this can be connected. FairSync just started. and Prezdecheznous is definitly intresting to connect, so we might us InCommon at least to sycronize to all GogoCarto-Platoforms](

More basic infos you find here:
Milestones and Protocols are done in


It would be very useful if you came to OFFDEM next week-end (next to FOSDEM) since a number of interested people from the ActivityPub community will be there for the SocialHub gathering. Otherwise the upcoming InterMapping event @natacha mentioned would be the next best moment.

I will check if somebody form opfenfairDB or FairSync can join there (

In the end it is also a financial question. For is it is traveling cost and timewise quite an investment. Do you have an idea?

Yes we certainly could think about funding some travel for Intermapping, I think OFFdem is to short in time to make it worth a move if no one of your team is around Brussels (for fosdem for example).
I ll do some update about intermapping next week +check the notes about the OFFdem Incommon meeting that will be reported here.

Sorry @natacha and @how
This time nobody from openfairDB or Fairsync is able to join Offdem. Next time with more preparation.
I will have a call with @yala today. Lets keep in contact.


Thanks for sharing the link!

How is it possible that I had never recognised it before, yet?

It seems to me, that if they added internationalisation to their UI only, and a less french-oriented domain name, that they could attract a lot more users.

@yala I do not really understand what you mean, IN COMMON is suppose to be the base to foster this internationalisation by means of sharing the data.

I used the term internationalisation here in the technical meaning of translating the user interface strings. All the elements are written in french, and I didn’t find an option to switch the locale. Adding a layer of internationalisation to the interface would allow to translate it in many different languages.

Update about fairsync:

  • For Synchronization we want to use calDAV as a widely spread standard:
    • calDAV for Events (which is interoperable with Nextcloud)
    • cardDAV for Locations (which builds on vCard)

ActivityPub will become interesting for us a bit later, when it comes to spread news and ratings.

Main part of fairsync will be a microservice to detect and handly duplicates.
This microservice can also provide an activity pub endpoint.

I have created an overview sheet, comparing datafields of openfairDB and vCard, which maches very well:
As soon as your fields at inCommon are documented, I will add them too.

@how @natacha: Do you mind just orientating the fields of in Common along the speicifaction of vCards for locations and calDAV for Events?

We would very much love to be you delegate for the first version of data syncronization. Could you please send me a file where I can see, how gogocarto-data is structured?

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*DAV compatibility would be interesting. I need to do a bit of research on this, but if people are interested, it could become part of a milestone. Yet ActivityPub has probably more priority for IN COMMON. I guess @ekes from Radar would have an opinion regarding iCal data format, as suggested in a previous discussion we had about Mobilizon and alternatives.

I’ll try to do the same and see where IN COMMON stands.

Amazing this makes sense, we certainly could integrate the results. IN COMMON will encourage rich of information, to feed a relational model.

I think you should ask this directly to @Sebastian but I generally think it is documented here:

I agree with @how this is important conversation that we want to continue having especially as Mobilizon is developping, and yes the conversation about Ical