workflow_with_guard_expression.xml

<?xml version="1.0" ?>

<container xmlns="http://symfony.com/schema/dic/services"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:framework="http://symfony.com/schema/dic/symfony"
           xsi:schemaLocation="http://symfony.com/schema/dic/services https://symfony.com/schema/dic/services/services-1.0.xsd
                        http://symfony.com/schema/dic/symfony https://symfony.com/schema/dic/symfony/symfony-1.0.xsd">

    <framework:config>
        <framework:workflow name="article" type="workflow">
            <framework:initial-place>draft</framework:initial-place>
            <framework:marking-store type="multiple_state">
                <framework:argument>a</framework:argument>
                <framework:argument>a</framework:argument>
            </framework:marking-store>
            <framework:support>Symfony\Bundle\FrameworkBundle\Tests\DependencyInjection\FrameworkExtensionTest</framework:support>
            <framework:place>draft</framework:place>
            <framework:place>wait_for_journalist</framework:place>
            <framework:place>approved_by_journalist</framework:place>
            <framework:place>wait_for_spellchecker</framework:place>
            <framework:place>approved_by_spellchecker</framework:place>
            <framework:place>published</framework:place>
            <framework:transition name="request_review">
                <framework:from>draft</framework:from>
                <framework:to>wait_for_journalist</framework:to>
                <framework:to>wait_for_spellchecker</framework:to>
            </framework:transition>
            <framework:transition name="journalist_approval">
                <framework:from>wait_for_journalist</framework:from>
                <framework:to>approved_by_journalist</framework:to>
            </framework:transition>
            <framework:transition name="spellchecker_approval">
                <framework:from>wait_for_spellchecker</framework:from>
                <framework:to>approved_by_spellchecker</framework:to>
            </framework:transition>
            <framework:transition name="publish">
                <framework:from>approved_by_journalist</framework:from>
                <framework:from>approved_by_spellchecker</framework:from>
                <framework:to>published</framework:to>
                <framework:guard>!!true</framework:guard>
            </framework:transition>
            <framework:transition name="publish">
                <framework:from>draft</framework:from>
                <framework:to>published</framework:to>
                <framework:guard>!!false</framework:guard>
            </framework:transition>
        </framework:workflow>
    </framework:config>
</container>