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# {extends}`{extends}` tags are used in child templates in template inheritance forextending parent templates. For details see section of [TemplateInheritance](../../programmers/advanced-features/advanced-features-template-inheritance.md).- The `{extends}` tag must be on the first line of the template.- If a child template extends a parent template with the `{extends}`tag it may contain only `{block}` tags. Any other template contentis ignored.- Use the syntax for [template resources](../../programmers/resources.md) to extend filesoutside the [`$template_dir`](../../programmers/api-variables/variable-template-dir.md) directory.## Attributes| Attribute | Required | Description ||-----------|----------|-------------------------------------------------|| file | Yes | The name of the template file which is extended |> **Note**>> When extending a variable parent like `{extends file=$parent_file}`,> make sure you include `$parent_file` in the> [`$compile_id`](../../programmers/api-variables/variable-compile-id.md). Otherwise, Smarty cannot> distinguish between different `$parent_file`s.## Examples```smarty{extends file='parent.tpl'}{extends 'parent.tpl'} {* short-hand *}```See also [Template Inheritance](../../programmers/advanced-features/advanced-features-template-inheritance.md)and [`{block}`](./language-function-block.md).