This feature proposes that each shape have a collection of arbitrary properties associated with it. These properties could be displayed and edited through a modal. A table within the modal would allow users to add/edit name/value pairs. This is incredibly useful for engineering diagrams, where additional properties might look like this:
repository: ws_code
owner: alix_owen
name: customer_create
payload: customer_info
status: completed
etc…
Having a generic attribute editor would be great.