High Impedance & Undefined

The High Impedance is given by a z and is represented by a straight centered line. The Undefined is given by a x and is represented by hatch pattern.

A Undefined line needs to be extended with a . to avoid a transition.

dataresponse
{
    signal: [
        { name: "data",     wave: "0z..1z.x.." },
        { name: "response", wave: "0x..1x.z.." },
    ]
}