define a world coordinate space within an AGViewport
   AGPrimitive+AGWorldParams AGWorld
{
     axleColor          = "antibackground";
     axleWidth          = 0.5;
     labelColor         = "antibackground";
     labelFont          = "roman-simplex";
     labelHeight        = 3.5;
     majorTickColor     = "antibackground";
     majorTickLineStyle = "solid";
     majorTickOn        = 1;
     majorTickWidth     = 0.5;
     minorTickColor     = "grey";
     minorTickCount     = 0;
     minorTickLineStyle = "dashed";
     minorTickWidth     = 0.25;
     niceLimits         = 1;
     textColor          = "antibackground";
     textFont           = "sw:roman-complex";
     AGPrimitive+IPort2+read &children[];
};
AGWorld links objects with equal world coordinate scaling. Connections to objects that are to share the same world coordinate space are done through the children reference array.