<!ELEMENT CustomerID EMPTY>

<!ATTLIST CustomerID

number CDATA #REQUIRED

name CDATA #REQUIRED>

<!ELEMENT Customer (CustomerID, Address, (Contact, Phone)? ) >

<!ELEMENT Address (Street,City,State,PostalCode,Country) >

<!ELEMENT Street (#PCDATA) >

<!ELEMENT City (#PCDATA) >

<!ELEMENT State (#PCDATA) >

<!ELEMENT PostalCode (#PCDATA) >

<!ELEMENT Counry (#PCDATA) >

<!ELEMENT Contact (#PCDATA) >

<!ELEMENT Phone (#PCDATA) >

<!ELEMENT Order (Customer, Order.date, LineItems) >

<!ATTLIST Order

number CDATA #REQUIRED

status (Open | BackOrdered | Shipped | Closed) "Open"

>

<!ELEMENT Order.date (#PCDATA) >

<!ELEMENT LineItems (LineItem+) >

<!ELEMENT LineItem (Quantity, Item) >

<!ATTLIST LineItem

number CDATA #REQUIRED

>

<!ELEMENT Quantity (#PCDATA) >

<!ELEMENT Item (Description, UnitPrice) >

<!ATTLIST Item

number CDATA #REQUIRED

>

<!ELEMENT Description (#PCDATA) >

<!ELEMENT UnitPrice (#PCDATA) >