Format for storing plotterparameters in prefix

@flavio.tarsetti how does the system associate plotters & plotterparameters?

The names aren't associated, as the plotterparameter plot/det_40x40/1 isn't a similar name to plot/isoroc/1. And the plotterparameter content is:

{
  "grid": true,
  "title": "DET ISO/IEC 19795-1:2006",
  "title-fontsize": 12,
  "det": true,
  "legend-loc": "best",
  "width": 800,
  "height": 600,
  "dpi": 120,
  "legend-fontsize": 8,
  "xlim-left": 0,
  "xlim-right": 40,
  "ylim-bottom": 0,
  "ylim-top": 40,
  "axis-fontsize": 10
}

How do we associate them?