Attachments to Doctrine Jira Issue DDC-868 - https://github.com/doctrine/doctrine2/issues/5390

10852_Droop.Model.Sysbase.dcm.xml

<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
                    http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

  <entity name="Droop\Model\Sysbase" table="system" inheritance-type="SINGLE_TABLE" >
    <id name="id" type="integer" column="id" >
        <generator strategy="AUTO" />
    </id>
    <field name="name" type="string" length="128"/>
    <field name="module" type="string" length="64"/>
    <field name="status" type="boolean" />
    <field name="weight" type="integer" />
    <field name="info" type="object" />

    <discriminator-column name="type" type="string" length="64" />
    <discriminator-map>
      <discriminator-mapping value="drooplet" class="Droop\Model\Drooplet" />
      <discriminator-mapping value="route" class="Droop\Model\Route" />
      <discriminator-mapping value="theme" class="Droop\Model\Theme" />
      <discriminator-mapping value="menu" class="Droop\Model\Menu" />
    </discriminator-map>

    <unique-constraints>
        <unique-constraint columns="name,type" name="system_index" />
    </unique-constraints>

  </entity>
</doctrine-mapping>

10853_Droop.Model.Drooplet.dcm.xml

<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
                    http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

  <entity name="Droop\Model\Drooplet"> 
  </entity>
</doctrine-mapping>

10854_Droop.Model.Menu.dcm.xml

<doctrine-mapping xmlns="http://doctrine-project.org/schemas/orm/doctrine-mapping"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://doctrine-project.org/schemas/orm/doctrine-mapping
                    http://doctrine-project.org/schemas/orm/doctrine-mapping.xsd">

  <entity name="Droop\Model\Menu"> 
  </entity>
</doctrine-mapping>