📄 bank-1.dtd
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<!--DOCTYPE bank-1 [-->
<!ELEMENT bank-1 ( ( account | customer | depositor)+)>
<!ELEMENT account (account-number, branch-name, balance)>
<!ELEMENT customer (customer-name, customer-street, customer-city)>
<!ELEMENT depositor (customer-name, account-number)>
<!ELEMENT account-number (#PCDATA)>
<!ELEMENT branch-name (#PCDATA)>
<!ELEMENT balance (#PCDATA)>
<!ELEMENT customer-name (#PCDATA)>
<!ELEMENT customer-street (#PCDATA)>
<!ELEMENT customer-city (#PCDATA)>
<!--] -->
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