<!ELEMENT Order (Customer, Part+)>
<!ATTLIST Order Key CDATA #REQUIRED>
<!ELEMENT Customer (Name, Email)>
<!ELEMENT Name (#PCDATA)>
<!ELEMENT Email (#PCDATA)>
<!ELEMENT Part (Key, Quantity, ExtendedPrice, Tax, Shipment+)>
<!ELEMENT Key (#PCDATA)>
<!ELEMENT Quantity (#PCDATA)>
<!ELEMENT ExtendedPrice (#PCDATA)>
<!ELEMENT Tax (#PCDATA)>
<!ATTLIST Part Color CDATA #REQUIRED>
<!ELEMENT Shipment (ShipDate, ShipMode, Comment?)>
<!ELEMENT ShipDate (#PCDATA)>
<!ELEMENT ShipMode (#PCDATA)>
<!ELEMENT Comment (#PCDATA)>

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