# The address law

<sub>**Beginner.** The one rule behind all resolution.</sub>

One rule governs all resolution:

> **Every spell lives at exactly one address: `(frame_key, binding_key)`**
> — `frame_key` is the `spellframe` if given, else the spell's name;
> `binding_key` is the `binding_name` if given, else the default slot.

**Excerpt.** Define both store classes and bind them before conjuring the conduit.
The lookup returns the `PostgresStore` registered as `primary`; the other binding
does not change which store that address selects.

```python
book.bind(spell=PostgresStore, existence="unique", binding_name="primary")
book.bind(spell=SqliteStore,   existence="unique", binding_name="local")

primary = conduit.meld("PostgresStore", binding_name="primary")
```

## Runnable examples

- [Named bindings](../examples/beginner/04-named-bindings.md) — Beginner 04
- [Meld address forms](../examples/beginner/26-meld-address-forms.md) — Beginner 26
- [Same name different frames](../examples/beginner/22-same-name-different-frames.md) — Beginner 22
- [Same class many names](../examples/beginner/24-same-class-many-names.md) — Beginner 24

[All beginner examples](../examples/beginner/index.md) · [Level contents](index.md) · [Full contents](../contents.md)

[Canonical page source](https://github.com/Synaptic724/melder/blob/0895ce795453cd87e35d70665957b4e89aad3317/README.md)