<!ELEMENT PMT_SOURCE_RECORD (clientNumber, paymentService?, description?, sourceType, cardName?, cardNumber, cardExpiry, billingZip?, cardSecurityCode?, customerVaultID?)> <!ELEMENT clientNumber (#PCDATA)> <!ELEMENT paymentService (#PCDATA)> <!ELEMENT description (#PCDATA)> <!ELEMENT sourceType (#PCDATA)> <!ELEMENT cardName (#PCDATA)> <!ELEMENT cardNumber (#PCDATA)> <!ELEMENT cardExpiry (#PCDATA)> <!ELEMENT billingZip (#PCDATA)> <!ELEMENT cardSecurityCode (#PCDATA)> <!ELEMENT customerVaultID (#PCDATA)>