DemandExpression
A DemandExpression is a richer canonical network expression describing a valued future condition together with requirements that may include quantity, quality, time, Place, acceptance criteria, economics, incentives, or conditional commitment state.
Specification-sourced: quoted from the governing specification, pending the applicable specification-owner approvals. The specification controls.
In plain words
A DemandExpression can take part in market-facing coordination while remaining distinct from both a Seek and a Commitment. A buyer stating the quantity, quality and timing of grain it would value is expressing demand, not yet committing to it.