# Glossary

## `bootstrap`

An instantiation argument that defaults to `true`. If set to `false`, internal [bootstrap](https://claycms.gitbook.io/amphora/startup/bootstrap) process will be skipped.

## `locals.publishUrl`

A propery only availble to components during the save of an `@published` instance of a component. This value is determined by whatever url is determined during [publishing](https://claycms.gitbook.io/amphora/basics/publishing#setting-publish-rules).

## `_version`

A data property managed by Amphora when using the [Data Versioning](https://claycms.gitbook.io/amphora/advanced/upgrade) feature. This property should not be overwritten to by any `model.js` or external source. If it is, data upgrades will be re-run. Please see the *Data Versioning* page for more information.