6.4.17 The Operator +
This operator may only be used in the following ways:
- string1
+
string2 - This yields the concatenation of string1 and string2.
- list1
+
list2 - This yields the concatenation of list1 and list2.
- number1
+
number2 - This yields the sum of number1 and number2.
- record1
+
record2 - This yields a record wich consists of all attributes of record1
and record2. If record1 and record2 have a common
attribute names, the corresponding attributes in the result record will
have the attribute values from record2, in contrast to the
operator *.