# Template Inheritance
ADX supports Jinja's template inheritance features, allowing you to reuse and extend template definitions. The templates are referenced by their keys defined in **Templates and Assets → ADX Templates**.
## Include
The `{% include %}` tag allows you to include the content of another template within the current template.
```markup
{% include "header_template" %}
Main content here
{% include "footer_template" %}
```
## Extends
The `{% extends %}` tag enables template inheritance. A child template can extend a base template and override specific blocks.
**Base template (`base_layout`):**
```markup
Company Letterhead
{% block content %}{% endblock %}
```
**Child template:**
```markup
{% extends "base_layout" %}
{% block content %}
Specific document content here
{{e.name}}
{% endblock %}
```
Use `{{ super() }}` to render the parent block's content:
```markup
{% extends "base_layout" %}
{% block content %}
{{ super() }}
Additional content after the parent content
{% endblock %}
```
## Import
The `{% import %}` tag allows you to import macros and variables from another template.
**Helper template (`common_macros`):**
```markup
{% set copyright -%}
© 2024 Atfinity AG. All rights reserved.
{%- endset %}
{% macro address_block(entity) -%}
{{entity.name}}
{{entity.street}}
{{entity.zip}} {{entity.city}}
{%- endmacro %}
```
**Using the template:**
```markup
{% import "common_macros" as common %}
{{ common.address_block(e) }}
{{- common.copyright -}}
```
## Template Keys
All template references (`include`, `extends`, `import`) use the **key** defined in **Templates and Assets → ADX Templates**. These keys are unique identifiers for your template definitions.
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