pekko/akka-docs/rst/additional/code/docs/osgi/blueprint.xml

<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
           xmlns:akka="http://akka.io/xmlns/blueprint/v1.0.0">

    <akka:actor-system name="BlueprintSystem" />

    <akka:actor-system name="BlueprintSystemWithConfig">
        <akka:config>
            some.config {
              key=value
            }
        </akka:config>
    </akka:actor-system>
</blueprint>