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/usr/share/php/Symfony/Bundle/FrameworkBundle/Resources/config/serializer.xml is in php-symfony-framework-bundle 2.7.10-0ubuntu2.

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The actual contents of the file can be viewed below.

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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">

    <parameters>
        <parameter key="serializer.class">Symfony\Component\Serializer\Serializer</parameter>
        <parameter key="serializer.encoder.xml.class">Symfony\Component\Serializer\Encoder\XmlEncoder</parameter>
        <parameter key="serializer.encoder.json.class">Symfony\Component\Serializer\Encoder\JsonEncoder</parameter>
        <parameter key="serializer.mapping.cache.prefix" />
    </parameters>

    <services>
        <service id="serializer" class="%serializer.class%">
            <argument type="collection" />
            <argument type="collection" />
        </service>

        <service id="serializer.property_accessor" alias="property_accessor" public="false" />

        <!-- Normalizer -->
        <service id="serializer.normalizer.object" class="Symfony\Component\Serializer\Normalizer\ObjectNormalizer" public="false">
            <argument type="service" id="serializer.mapping.class_metadata_factory" />
            <argument>null</argument>
            <argument type="service" id="serializer.property_accessor" />

            <!-- Run after all custom serializers -->
            <tag name="serializer.normalizer" priority="-1000" />
        </service>

        <!-- Loader -->
        <service id="serializer.mapping.chain_loader" class="Symfony\Component\Serializer\Mapping\Loader\LoaderChain" public="false">
            <argument type="collection" />
        </service>

        <!-- Class Metadata Factory -->
        <service id="serializer.mapping.class_metadata_factory" class="Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactory" public="false">
            <argument type="service" id="serializer.mapping.chain_loader" />
            <argument>null</argument>
        </service>

        <!-- Cache -->
        <service id="serializer.mapping.cache.apc" class="Doctrine\Common\Cache\ApcCache" public="false">
            <call method="setNamespace">
                <argument>%serializer.mapping.cache.prefix%</argument>
            </call>
        </service>

        <!-- Encoders -->
        <service id="serializer.encoder.xml" class="%serializer.encoder.xml.class%" public="false">
            <tag name="serializer.encoder" />
        </service>

        <service id="serializer.encoder.json" class="%serializer.encoder.json.class%" public="false">
            <tag name="serializer.encoder" />
        </service>
    </services>
</container>