val length :
[> `Cap of float| `Ch of float| `Cm of float| `Cqb of float| `Cqh of float| `Cqi of float| `Cqmax of float| `Cqmin of float| `Cqw of float| `Em of float| `Ex of float| `Ic of float| `In of float| `Lh of float| `Mm of float| `Pc of float| `Pt of float| `Px of float| `Q of float| `Rem of float| `Rlh of float| `Vb of float| `Vh of float| `Vi of float| `Vmax of float| `Vmin of float| `Vw of float| `Zero ]Rule.rule
val angle :
[> `Deg of float| `Grad of float| `Rad of float| `Turn of float ]Rule.rule
val time : [> `Ms of float| `S of float ]Rule.rule
val frequency : [> `Hz of float| `KHz of float ]Rule.rule
val resolution : [> `Dpcm of float| `Dpi of float| `Dppx of float ]Rule.rule