The value collection element configures one of the value of collection data:

<object type="org.exoplatform.container.configuration.ConfigParam">

  <field name="role">

    <collection type="java.util.ArrayList">

      <value><string>manager</string></value>

      <value profiles="foo"><string>foo_manager</string></value>

      <value profiles="foo,bar"><string>foo_bar_manager</string></value>

    </collection>

  </field>

</object>