Format Specifications

Individual specifications for each PTA format.

Formats

Format	Versions	Description
beancount/	v2, v3	Double-entry with cost tracking
ledger/	v1	Original PTA format
hledger/	v1	Haskell implementation

Structure

Each format follows a consistent structure:

format/
├── README.md           # Overview and history
├── CHANGELOG.md        # Version history
├── vN/
│   ├── spec/           # Normative specification
│   │   ├── directives/ # One file per directive
│   │   └── ...
│   ├── grammar/        # EBNF and ABNF grammars
│   ├── schema/         # JSON Schema and Protobuf
│   ├── tree-sitter/    # Editor grammar
│   ├── formal/         # Alloy models
│   └── migration/      # Upgrade guides
└── compliance.md       # Conformance requirements