<!-- PCU: ch03-apr-format | contract: contracts/apr-book-ch03-v1.yaml -->
<!-- Example: cargo run -p aprender-core --example ch03_apr_format -->
<!-- Status: enforced -->
# Chapter 03: The APR Model Format
> Contract: [`apr-book-ch03`](../../../contracts/apr-book-ch03-v1.yaml)
Run: `cargo run -p aprender-core --example ch03_apr_format`
```rust,ignore
{{#include ../../../crates/aprender-core/examples/ch03_apr_format.rs}}
```