sdd:text
sdd:text is one of the frozen primitive layer's members (spec §4.5) — the value of sdd:primitive on a sdd:Datum that renders as a string. It is multiline-capable, distinguishing it from the terser primitives.
Alongside link, image, color, sdd:number, and rich, sdd:text is part of the leaf layer that data lines in a node stanza select from: a data line has the shape primitive path? value?, and sdd:text is the most common choice for labels and short descriptions.