web/web_action_conditionable/demo/ir_ui_view.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        <record id="view_res_groups_form" model="ir.ui.view">
            <field name="model">res.groups</field>
            <field name="inherit_id" ref="base.view_groups_form" />
            <field name="arch" type="xml">
                <xpath expr="//field[@name='model_access']/tree" position="attributes">
                    <attribute name="create">name == 'Access Rights'</attribute>
                    <attribute name="delete">name != 'Access Rights'</attribute>
                </xpath>
                <xpath expr="." position="attributes">
                    <attribute name="edit">name == 'Access Rights'</attribute>
                    <attribute name="delete">name != 'Access Rights'</attribute>
                </xpath>
            </field>
        </record>
    </data>
</openerp>