---
title: "Entity types"
slug: "entity-types"
updated: 2025-09-01T10:13:27Z
published: 2025-09-01T10:13:27Z
canonical: "documentation.deltatre.com/entity-types"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.deltatre.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Entity types

In this article, we cover the entities available in FORGE, used to shape the content and its presentation.

---

## Entities

Digital content is a mixture of text, photos, and videos. Each content type owns its structure and way of being crafted, delivered, and consumed.

FORGE formalizes content type with the*entities.* Each entity is designed to make it efficient to craft and control the specific structure of a content type.

FORGE provides some built-in entity types — the most common ones — but allows customizing them too.

## Built-in types

FORGE comes with a set of built-in entities, each one meant to contain specific content:

- Photo: It contains a photo.
- Album: It contains a set of photos.
- Document: It contains an attachment.
- Story: It contains one or many:
  - Photo
  - Album
  - Document
- Editorial selection: It contains one or many:
  - Story
  - Photo
  - Album
  - Document

## Custom types

When you, as a producer, need to shape entities beyond the built-in ones, there are two levels of customization you can proceed with:

- **Extended fields**: adding custom fields to the built-in entities.
- **Custom entities**: Defining a new entity from scratch by declaring it through a JSON.

### Reference scenario

For your project, *A big fan of Alpha*, you want to manage the Player as a structured entity to speed up its usage into stories. Defining the custom entity Player meets that need.

Consider the following setup for the Jim Mij:

![](https://cdn.document360.io/2e698e3c-4773-44a4-9476-1d05bac85eee/Images/Documentation/10503672162332.png)

A story that uses the player Jim Mij looks like the following:

![](https://cdn.document360.io/2e698e3c-4773-44a4-9476-1d05bac85eee/Images/Documentation/10503636009756.png)