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TaggableBehaviorBundle / Resources / config / services.xml

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

    <services>
        <service id="propel.taggable_behavior.form.type.tags" class="Propel\TaggableBehaviorBundle\Form\Type\TagsType">
            <tag name="form.type" alias="tags" />
        </service>
    </services>
</container>