Example of Trello card comment with link to another idea. #dep_on - idea depends on another idea; "https://trello.com/c/RaNcbKSe" - is the short link to the Trello card with the  connected idea. In the visualization it would be represented as a line connecting two ideas.  
  Part of: Kramer B, Bosman J, Ignac M, Kral C, Kalleinen T, Koskinen P, Bruno I, Buckland A, Callaghan S, Champieux R, Chapman C, Hagstrom S, Martone M, Murphy F, O'Donnell D (2016) Defining the Scholarly Commons - Reimagining Research Communication. Report of Force11 SCWG Workshop, Madrid, Spain, February 25-27, 2016. Research Ideas and Outcomes 2: e9340. https://doi.org/10.3897/rio.2.e9340