27 Feb
2014
27 Feb
'14
9:54 a.m.
hi, Operators The operator used to assign the value of the attribute may be one of the following, with the given meaning. = Add the attribute to the list, if and only if an attribute of the same name is not already present in that list. := Add the attribute to the list. If any attribute of the same name is already present in that list, its value is replaced with the value of the current attribute. += Add the attribute to the tail of the list, even if attributes of the same name are already present in the list. ??? alan