Annotations
Brackets are optional — they're added in the output. I1=R1,+1 draws an arrow on R1; Vx=R1,+1,-1 draws + Vx − on R1's free side. Coordinates also work: Ix=2,1,2,3. LOOP1=R1,R2,VS1 draws a clockwise loop arrow inside the shape those components form (add ,-1 for counter-clockwise). SEC1=WG1,R1 draws a dashed box around those components; SEC1=x1,y1,x2,y2 boxes a coordinate rectangle.