<!ELEMENT job       (schema | instance | display | optimize)*>

<!ELEMENT title     (#CDATA)>
<!ELEMENT text      (#CDATA)>

<!ELEMENT schemа    (title | text | parameter*)>
<!ATTLIST schema id ID #REQUIRED>

<!ELEMENT instance (title | parameter*)>
<!ATTLIST instance id ID #REQUIRED>

<!ELEMENT parameter EMPTY>
<!ATTLIST parameter name CDATA #REQUIRED>
<!ATTLIST parameter value CDATA #REQUIRED>

<!ELEMENT display   EMPTY>
<!ATTLIST display   instance IDREF #REQUIRED>
<!ATTLIST display   time CDATA #REQUIRED>
<!ATTLIST display   step CDATA #REQUIRED>
<!ATTLIST display   statistics CDATA #IMPLIED>