Low: flat vs. tree

• depends on the nature of the data model
• if data model is tree, best use a tree format
• ... doable with flat format, but will be painful
• most EDA data models are either a tree...
• ... of will become a tree very soon

(module sot23 (layer F.Cu) (at 110 105) (descr "SOT-23, Standard")
  (fp_text reference U1 (at 0 -2.5) (layer F.SilkS) hide
    (effects (font (size 1 1) (thickness 0.15)))
  )
  (fp_line (start -0.7 -0.95) (end -0.7 1.5) (layer F.Fab) (width 0.1))
  (fp_line (start -0.15 -1.52) (end 0.7 -1.52) (layer F.Fab) (width 0.1))
)

gEDA/PCB (mostly flat):

Layer(1 "top-sig")
(
	Attribute("pcb-rnd::key::vis" "<Key>l; Shift<Key>t")
	Attribute("pcb-rnd::key::select" "<Key>l; <Key>t")
	Text[50.0mil 0.0 0 100 "hello world" "clearline"]
	Text[25.0mil 75.0mil 0 100 "all your base" "clearline"]
)

pcb-rnd lihata board (tree):

li:layers {
  ha:top-sig {
    ha:attributes {
      {pcb-rnd::key::vis}={l; Shiftt}
      {pcb-rnd::key::select}={l; t}
    }
    li:objects {
      ha:text.5 {
       string=hello world; x=50.0mil; y=0.0; scale=100; fid=0; rot = 0.000000
       ha:flags { clearline=1 }
      }
      ha:text.7 {
       string=all your base; x=25.0mil; y=75.0mil; scale=100; fid=0; rot = 0.000000
       ha:flags { clearline=1 }
      }
    }
  }
}