<!ELEMENT gnc:commodity (cmdty:space, cmdty:id, cmdty:name,
                         cmdty:xcode?, cmdty:fraction)>
<!ATTLIST gnc:commodity version CDATA #REQUIRED>

<!ELEMENT cmdty:space (#PCDATA)>
<!ELEMENT cmdty:id (#PCDATA)>
<!ELEMENT cmdty:name (#PCDATA)>
<!ELEMENT cmdty:xcode (#PCDATA)>
<!ELEMENT cmdty:fraction (#PCDATA)>