<?xml version="1.0" ?>
<openerp>
    <data>
        <record model="ir.module.category" id="module_lunch_category">
            <field name="name">Lunch</field>
            <field name="description">Helps you handle your lunch needs, if you are a manager you will be able to create new products, cashmoves and to confirm or cancel orders.</field>
            <field name="sequence">16</field>
        </record>
        <record id="group_lunch_user" model="res.groups">
            <field name="name">User</field>
            <field name="category_id" ref="module_lunch_category"/>
        </record>
        <record id="group_lunch_manager" model="res.groups">
            <field name="name">Manager</field>
            <field name="implied_ids" eval="[(4, ref('group_lunch_user'))]"/>
            <field name="category_id" ref="module_lunch_category"/>
            <field name="users" eval="[(4, ref('base.user_root'))]"/>
        </record>
    </data>
</openerp>

I'm now stuck with security handling to my application.its code shows here

I refer documentation also for clarify the above xml code. but i'm not get good explanation for version 7 in documentation.i need to clarify below sections. please advice me to get clear idea about it

Please explain

ir.module.category means.?

<record model="ir.module.category" id="module_lunch_category">

model="res.groups" means.?

<record id="group_lunch_user" model="res.groups">

need to clarify whole below line

<field name="implied_ids" eval="[(4, ref('group_lunch_user'))]"/>