<?xml version="1.0" encoding="UTF-8"?>

<!ELEMENT timers (gaussian | constant)* >

<!ELEMENT gaussian EMPTY >
<!ATTLIST gaussian id ID #REQUIRED
                   mean CDATA #REQUIRED
                   stdev CDATA #REQUIRED >

<!ELEMENT constant EMPTY >
<!ATTLIST constant id ID #REQUIRED
                   duration CDATA #REQUIRED>