<xs:element name="InvoiceProductGroup">
<xs:complexType>
<xs:sequence>
<xs:element ref="ProductGroupID" minOccurs="0" />
<xs:element ref="InvoiceWoodLineItem" maxOccurs="unbounded" />
<xs:element ref="ProductGroupSummary" minOccurs="0" />
</xs:sequence>
</xs:complexType>
</xs:element>
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