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+# Email Templates XML Reference Documentation
+
+This reference documentation provides detailed information on the structure and usage of the `email_templates.xml` file
+in Magento 2. It is intended for developers familiar with PHP and Magento 2, and aims to provide authoritative and
+knowledgeable guidance on creating and configuring email templates using XML.
+
+## Introduction
+
+The `email_templates.xml` file is an important configuration file used in Magento 2 to define email templates that can
+be used for various email communications sent by the system. It allows developers to create customizable email templates
+with dynamic content and configuration options.
+
+This document provides a comprehensive guide on how to create, configure, and utilize email templates using
+the `email_templates.xml` file in Magento 2.
+
+## Structure of email_templates.xml
+
+The `email_templates.xml` file follows a specific XML structure that defines the email templates and their associated
+configurations. Here is a basic example of the structure:
+
+```xml
+
+<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+        xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Email:etc/email_templates.xsd">
+    <template id="template_id" label="Template Label" file="file_name.html" type="html">
+        <variables>
+            <!-- Variable definitions -->
+        </variables>
+        <styles>
+            <!-- CSS definitions -->
+        </styles>
+    </template>
+</config>
+```
+
+The root `<config>` element contains the XML namespace declaration and the schema location for validation.
+Inside `<config>`, there can be one or more `<template>` elements representing individual email templates.
+
+Each `<template>` element requires the following attributes:
+
+- `id`: A unique identifier for the template, typically in lowercase with underscores.
+- `label`: A human-readable label or name for the template.
+- `file`: The file name of the template HTML file (e.g., `file_name.html`).
+- `type`: The content type of the template, typically `html` for HTML email templates.
+
+## Creating Email Templates
+
+To create a new email template, you need to add a `<template>` element inside the `<config>` element of
+the `email_templates.xml` file. Here's an example:
+
+```xml
+
+<template id="custom_template" label="Custom Template" file="custom_template.html" type="html">
+    <!-- Variable definitions and CSS styles go here -->
+</template>
+```
+
+In the above example, we have defined a new email template with the ID `custom_template`, label `Custom Template`, and
+associated HTML file `custom_template.html`.
+
+## Using Variables
+
+Email templates often require dynamic content, such as customer names, order details, or product information. Magento 2
+provides a way to include variables in email templates to dynamically populate data.
+
+To define variables for an email template, you need to add `<variable>` elements inside the `<variables>` section of
+the `<template>` element. Here's an example:
+
+```xml
+
+<template id="custom_template" label="Custom Template" file="custom_template.html" type="html">
+    <variables>
+        <variable name="customer_name" xsi:type="string">John Doe</variable>
+        <variable name="order_id" xsi:type="string">12345</variable>
+    </variables>
+    <!-- CSS styles and email content go here -->
+</template>
+```
+
+In the above example, we have defined two variables: `customer_name` and `order_id`. These variables can be accessed
+within the email template HTML file using the following syntax:
+
+```html
+<p>Dear {{var customer_name}},</p>
+<p>Your order with ID {{var order_id}} has been processed.</p>
+```
+
+During email rendering, the variables will be replaced with their corresponding values.
+
+## Configuring Templates
+
+Apart from variable definitions, you can configure various aspects of an email template using the `<template>` element's
+attributes. These attributes allow you to specify the subject, sender, and other settings for the email template.
+
+Here's an example of configuring an email template:
+
+```xml
+
+<template id="custom_template" label="Custom Template" file="custom_template.html" type="html"
+          subject="Custom Template Subject" sender_name="Store Name" sender_email="[email protected]">
+    <!-- Variable definitions, CSS styles, and email content go here -->
+</template>
+```
+
+In the above example, we have added the `subject`, `sender_name`, and `sender_email` attributes to the `<template>`
+element. These attributes control the subject line, sender name, and sender email address for the email template.
+
+## Advanced Configuration
+
+The `email_templates.xml` file supports advanced configuration options to customize email headers, attachments, and
+more. Here are a couple of examples:
+
+### Adding Custom Headers
+
+You can add custom headers to the email template by using the `<headers>` element inside the `<template>` element.
+Here's an example:
+
+```xml
+
+<template id="custom_template" label="Custom Template" file="custom_template.html" type="html" ...>
+<headers>
+<header name="X-Custom-Header">Custom Value</header>
+</headers>
+        <!-- Variable definitions, CSS styles, and email content go here -->
+        </template>
+```
+
+In the above example, we have added a custom header `X-Custom-Header` with the value `Custom Value` to the email
+template.
+
+### Adding Attachments
+
+To include attachments in the email template, you can use the `<attachments>` element inside the `<template>` element.
+Here's an example:
+
+```xml
+
+<template id="custom_template" label="Custom Template" file="custom_template.html" type="html" ...>
+<attachments>
+<attachment type="mimetype" encoding="encoding_type">attachment_content</attachment>
+</attachments>
+        <!-- Variable definitions, CSS styles, and email content go here -->
+        </template>
+```
+
+In the above example, we have added an attachment with the specified `type`, `encoding`, and `attachment_content`.
+Replace these values with the appropriate attachment details.
+
+## Conclusion
+
+The `email_templates.xml` file plays a crucial role in defining and configuring email templates in Magento 2. By
+understanding its structure and utilizing its features, you can create customizable email templates with dynamic
+content, variables, and advanced configuration options.
+
+This reference documentation has provided you with a comprehensive understanding of `email_templates.xml` and equipped
+you with the knowledge to create and configure email templates in Magento 2.