<!ELEMENT trial (input)+>

<!ELEMENT trial (input)+>
<!ATTLIST trial id ID #REQUIRED>

<!ELEMENT input (param)*>
<!ATTLIST input type CDATA #REQUIRED>

<!ELEMENT population (param)*>
<!ATTLIST population id ID #REQUIRED>
<!ATTLIST population type CDATA #REQUIRED>

<!ELEMENT range EMPTY>
<!ATTLIST range name CDATA #REQUIRED>
<!ATTLIST range start CDATA #REQUIRED>
<!ATTLIST range end CDATA #REQUIRED>
<!ATTLIST range step CDATA "1">


<!ELEMENT param (#PCDATA | range)>
<!ATTLIST param name CDATA #REQUIRED>
<!ATTLIST param sigma CDATA "0">

<!ELEMENT connection EMPTY>
<!ATTLIST connection from IDREF #REQUIRED>
<!ATTLIST connection to IDREF #REQUIRED>
<!ATTLIST connection weight CDATA #REQUIRED>
<!ATTLIST connection sigma CDATA "0">
<!ATTLIST connection density CDATA "1">
<!ATTLIST connection direction CDATA "oneway">