ref. D1.2 p54, D3.4 p72
screenshots from http://gnumbo.dyne.im/barter
backlog https://trello.com/c/snt0hhKU

As a bartering coop member i need to share bartering items in an activitystream in d-cent, and access on a map what others have shared.

1. User takes a photo of a bartering item to offer it for bartering. Geolocation is stored and text string metadata is asked on the same form.
2. Photo and metadata is uploaded to the service.
3. User is taken to a map of bartering items available with picture and written metadata. There should be a radius filter of nn kilometers.
4. User has a search box on to filter items through category and/or keyword.
   Alternative use cases
   User has a button to return to activity streams.
   User has a button to add new bartering item.

Open decisions
Should Users' items be browsable elsewhere than on the map search functionality, should there be a search result listing page?
What are the bartering items' states and notifications?