The XML elements for subfunctions for variables and values (see section 9.7.1 on page ) have the names:
variable) contains the value of the number / identifier of the variable, as it is defined above.
Furthermore, there are real subfunctions (see section 9.7.2 on page ). These contain for each of ther subfunction a XML element.
Names of subfunctions with an arity of one are:
abs: absolute value
arcsin: arc sine
Names of subfunctions with an arity of two are:
expsubfunctions the the sequence of the contained XML elements is important. In them the first contained XML element is the first contained subfunction of the subfunction.
if: if-function (before its two subfunctions, first the condition of the if-subfunction is stored, the order of the XML subelements is: condition, true case (subfunction), false case (subfunction); see section 22.3.8 on page )