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Execution flow
Aqua's main goal is to express how the execution flows: moves from peer to peer, forks to parallel flows and then joins back, uses data from one step in another.
As the foundation of Aqua is based on π-calculus, finally flow is decomposed into sequential `seq`, `.`, conditional `xor`, `+`, parallel `par`, `|` computations and iterations based on data `!P`. For each basic way to organize the flow, Aqua follows a set of rules to execute the operations:
- What data is available for use?
- What data is exported and can be used below?
- How errors and failures are handled?
These rules form a contract, as in design-by-contract programming.