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This operator may only be used in the following ways:
- The expression `` string1 + string2'' yields the
concatenation of string1 and string2.
- The expression `` list1 + list2'' yields the
concatenation of list1 and list2.
- The expression `` number1 + number2'' yields the sum
of number1 and number2.
- The expression `` record1 + record2'' 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 `` *''.
Bjoern Beutel