Allow modules to "provide" services in their module.xml

    <module name="my.module" xmlns="urn:jboss:module:1.8">
        <!-- some stuff here -->
        <provides>
            <service name="javax.something.Whatever">
                <with-class name="my.module.impls.WhateverImpl1"/>
                <with-class name="my.module.impls.WhateverImpl2"/>
            </service>
        </provides>
    </module>