Choices

<!ELEMENT ITEM (PRODUCT, NUMBER, (PRICE | CHARGEACCT | SAMPLE))>

  <ITEM>
     <PRODUCT>Tomatoes</PRODUCT>
     <NUMBER>8</NUMBER>
     <PRICE>$1.25</PRICE>
  </ITEM>
  <ITEM>
     <PRODUCT>Oranges</PRODUCT>
     <NUMBER>24</NUMBER>
     <SAMPLE>$4.98</SAMPLE>
  </ITEM>