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<?xml version="1.0" encoding="ISO-8859-1"?>
<!ELEMENT interps (source?,heading?,input?,interp*)>
<!ATTLIST interps number_of_interps CDATA #IMPLIED>
<!ELEMENT interp (op0|op1|op2|opn)*>
<!ATTLIST interp size CDATA #REQUIRED
number CDATA #IMPLIED
seconds CDATA #IMPLIED>
<!ELEMENT sym (#PCDATA)> <!-- symbol -->
<!ELEMENT i (#PCDATA)> <!-- index -->
<!ELEMENT v (#PCDATA)> <!-- value -->
<!ELEMENT head (i+)>
<!ELEMENT row (i?,e+)>
<!ELEMENT tupval (tup,v)> <!-- tuple-value -->
<!ELEMENT tup (i*)> <!-- tuple -->
<!ELEMENT op0 (sym,v)> <!-- arity 0 -->
<!ATTLIST op0 type CDATA #REQUIRED>
<!ELEMENT op1 (sym,head,row)> <!-- arity 1 -->
<!ATTLIST op1 type CDATA #REQUIRED>
<!ELEMENT op2 (sym,head,row+)> <!-- arity 2 -->
<!ATTLIST op2 type CDATA #REQUIRED>
<!ELEMENT opn (sym,tupval+)> <!-- arity >2 -->
<!ATTLIST opn type CDATA #REQUIRED
arity CDATA #REQUIRED>
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