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EVA is the BRIK64 composition model. It gives agents and developers three ways to explain how circuit units connect.

Sequential

Sequential composition is the normal pipeline shape.
The amount and fee inputs feed a named numeric operation.

Conditional

Conditional composition must close every branch.
Every path returns a value, and the blocked paths are explicit.

Parallel

Use parallel composition only when branches are independent. In PCD examples, represent this as separate values that do not mutate shared state.

Authoring Guidance

Do not invent symbolic EVA syntax in executable PCD. Use source structure and topology metadata unless a specific compiler release documents a supported symbolic form.