whether the given schema is non-deterministic or not

Hi..
 
Can you please tell me whether the following schema is non-deterministic or
not??
According to spec. two element particles if they are overlap and if thery
both are under choice/ALL model group, then that schema is
non-deterministic. 
But in the following schema, one e1 is under choice and other e1 is under
sequence. So, the schema is not a non-deterministic.
 
Please reply me whether i am correct or not.
<?xml version="1.0"?>

<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">

<xsd:element name="doc" type="foo"/>

            <xsd:complexType name="foo">

                <xsd:choice>

                        <xsd:element name="e1" type="xsd:string"/>

                    <xsd:group ref="group"/>

                </xsd:choice>

        </xsd:complexType>

<xsd:group name="group">

    <xsd:sequence>

        <xsd:element name="e1" type="xsd:string"/>

    </xsd:sequence>

</xsd:group>

</xsd:schema>

 

Thanks and Regards,

Bharath