[Last modified: Sept 94]

Answer: In UIL, you have to explicitly create a compound string with a
separator.  Here's what W. Scott Meeks suggests:

value nl : compound_string('', seperate=true);

object my_label : XmLabel
{
arguments
{
XmNlabelString = 'Here' & nl & 'is' & nl & 'the' & nl & 'Label';
};
};