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Cratis Cratis Cratis

Projection Declaration Language

The Projection Declaration Language (PDL) is part of the Cratis Screenplay language — the declarative, indentation-based language for describing Cratis applications. Chronicle uses the Screenplay compiler to parse projection declarations and turn them into projection definitions.

The full language reference — from-event rules, property mapping, auto-map, keys, event context, counters, arithmetic, joins, children, nested objects, removal, expressions, and the grammar — lives in the Screenplay documentation:

What remains here

Section titled “What remains here”

Chronicle-specific client APIs that consume PDL declarations are documented in this section:

  • Ad-hoc Querying — running a PDL declaration ad-hoc with IProjections.Query().