The predefined groups are specified in the group field of the OrganizationConfig plugin parameter.

<field name="group">

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

    <value>

      <object type="org.exoplatform.services.organization.OrganizationConfig$Group">

        <field name="name">

          <string>portal</string>

        </field>

        <field name="parentId">

          <string></string>

        </field>

        <field name="type">

          <string>hierachy</string>

        </field>

        <field name="description">

          <string>the /portal group</string>

        </field>

      </object>

    </value>

    <value>

      <object type="org.exoplatform.services.organization.OrganizationConfig$Group">

        <field name="name">

          <string>community</string>

        </field>

        <field name="parentId">

          <string>/portal</string>

        </field>

        <field name="type">

          <string>hierachy</string>

        </field>

        <field name="description">

          <string>the /portal/community group</string>

        </field>

      </object>

    </value>

    ...

  </collection>

</field>