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<!ELEMENT problem (desc, include?, solution, case)>
<!ELEMENT desc (#PCDATA)>
<!ELEMENT include (#PCDATA)>
<!ELEMENT solution (#PCDATA)>
<!ELEMENT case (stdin?, file*, var*)>
<!ATTLIST case
name CDATA #REQUIRED
>
<!ELEMENT stdin (#PCDATA)>
<!ELEMENT stdout (#PCDATA)>
<!ELEMENT file (#PCDATA)>
<!ATTLIST file
name CDATA #REQUIRED
type (check|norm) #IMPLIED
>
<!ELEMENT var EMPTY>
<!ATTLIST var
name CDATA #REQUIRED
value CDATA #REQUIRED
>
<!ELEMENT function (stdout?, file*)>
<!ATTLIST function
desc CDATA #REQUIRED
default (ignore|match) #REQUIRED
>
|