odoo/addons/point_of_sale/point_of_sale_data.xml

<?xml version="1.0" ?>
<openerp>
    <data>
        <record model="pos.config" id="pos_config_main">
            <field name="name">Main PoS</field>
        </record>
    </data>

    <data noupdate="1">
        <!-- notify all employees of module installation -->
        <function model="mail.group" name="message_append_note">
            <!-- ids, subject, body, parent_id=False, type='notification', content_subtype='html' -->
            <value eval="[ref('mail.group_all_employees')]"/>
            <value>Module Point of Sale has been installed</value>
            <value>Encode sale orders, register payments, compute money to return,
                create invoices, and manage refunds of former sales through a
                specific, web-based, user interface.

                Simply click on the top menu "Point of Sale" to launch its
                interface.  You can configure your point of sale and perform
                backend operations in the menu "PoS Backend".
            </value>
        </function>
    </data>
</openerp>