---
numbering:
  title: true
---

# `arch.Architectonic`: The Central Registry

```{py:currentmodule} arch.Architectonic
```

`Architectonic` is the core of the package: a pydantic model that loads a four-level tree of `Cell` rows from an architectonic file, maps every `Idx` to its source language, filesystem path, and database record, and exposes the whole structure through mapping-style access.
A single default instance is constructed at import time and exported as `ARCH`, located via `$MY_ARCH` or the nearest architectonic file below the current directory.

```{eval-rst}
.. autoclass:: arch.Architectonic.Architectonic
```