1
A string_literal is formed by a sequence of graphic characters (possibly none) enclosed between two quotation marks used as string brackets. They are used to represent operator_symbols (see 6.1), values of a string type (see 4.2), and array subaggregates (see 4.3.3).
2
string_literal::= "{string_element}"
3
string_element::= "" | non_quotation_mark_graphic_character
4
A string_element is either a pair of quotation marks (""), or a single graphic_character other than a quotation mark.
5
The sequence of characters of a string_literal is formed from the sequence of string_elements between the bracketing quotation marks, in the given order, with a string_element that is "" becoming a single quotation mark in the sequence of characters, and any other string_element being reproduced in the sequence.
6
A null string literal is a string_literal with no string_elements between the quotation marks.
NOTES
7
6 An end of line cannot appear in a string_literal.
7.1/2
7 No transformation is performed on the sequence of characters of a string_literal.
8
Examples of string literals:
9/2
"Message of the day:" "" −− a null string literal " " "A" """" −− three string literals of length 1 "Characters such as $, %, and } are allowed in string literals" "Archimedes said ""[Unicode 917] [Unicode 973] [Unicode 961] [Unicode 951] [Unicode 954] [Unicode 945] """ "Volume of cylinder (PIr²h) = "