Jarlssen_CustomCartValidation - config configuration example.xml

<global>

        <jarlssen_custom_cart_validation>
            <rules>
                <different_manufacturer_not_allowed>
                    <product_type>simple</product_type>
                    <model>example_validation/validator_validateAllowedManufacturers</model>
                    <origin>example_validation</origin>
                    <code>1</code>
                </different_manufacturer_not_allowed>
                <multiple_quantity_validation>
                    <product_type>*</product_type>
                    <model>example_validation/validator_validateMultipleQty</model>
                    <origin>example_validation</origin>
                    <code>2</code>
                </multiple_quantity_validation>
            </rules>
        </jarlssen_custom_cart_validation>

</global>