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To indicate an external Spring Boot properties file using the pom.xml file, you need to use the spring.config.location property in your project's configuration.

Here's an example:

<properties>
    <spring.config.location>file:/path/to/your/external/properties/file/application.properties</spring.config.location>
</properties>

You can replace the file protocol with other protocols like classpath, http, or https depending on where your external properties file is located.

If you have multiple external properties files, you can separate them using the : separator, like this:

<properties>
    <spring.config.location>file:/path/to/your/external/properties/folder/:file:/path/to/your/external/properties/file/application.properties</spring.config.location>
</properties>

This example indicates that there are two external properties files: application.properties located in /path/to/your/external/properties/file, and a folder containing other properties files located in /path/to/your/external/properties/folder/.