Returns the specified child definition of the given definition.
*Definition = UBE_ChildDefinition( *Definition [, Index.i] )
*Definition
A valid pointer to a definition. Index.i
The index of the child node.
It counts from the first child forward: 0, 1, 2, ...
or from the last child backward: -1, -2, -3, ...
The pointer to the child definition
or #Null
if the child definition doesn't exist.