namespace="##any" ???

Hi,
I'm working on a schema where a Complex Type is defined as following:

<xsd:complexType name="Tpsdata">
<xsd:complexContent>
<xsd:restriction base="xsd:anyType">
<xsd:sequence minOccurs="0" maxOccurs="unbounded">
<xsd:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>
</xsd:sequence>
</xsd:restriction>
</xsd:complexContent>
</xsd:complexType>

Could someone explain me what this Complex Type is, as I don't understand that line ?
>> <xsd:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/>

Cheers.
Denis