For the description of the function element see section 9.7 on page
.
The name of the function XML element is function. The function XML element has an attribute defined_variable. The attribute defined_variable indicates, which variable is defined by the function element. It is a natural number for a variable, that is not used above the function element for another variable.
Furthermore, the function element contains a subfunction element (this is described in subsection 22.3.7), which is contained in a separate XML element named subfunction.
After the subfunction element follows the XML element for the contained subobject.
An example for a function element:
<function defined_variable="2">
<subfunction>
<add>
<value>4</value>
<div>
<variable>1</variable>
<value>3.14</value>
</div>
</add>
</subfunction>
...<!-- Fib subobject -->
</function>