A character string literal is a string of printing characters
       up to 253 characters long. The maximum size for an input line
       in DEC DATATRIEVE is 255 characters, but in character string
       literals, two of those characters are used for the quotation
       marks. The printing characters consist of the uppercase and
       lowercase letters, numbers, and the following special characters:

       ! @ # $ % ^ & * ( ) - _ = + ` [

       { ] } ~ ; : ' " \ | , < . > / ?

       To type a literal on more than one line, enter a hyphen
       immediately before pressing the RETURN key. DEC DATATRIEVE strips
       the hyphen from that part of the character string literal and
       waits for you to complete the literal by typing the closing
       quotation mark. As long as the total number of characters in
       the literal does not exceed 253, you can use any number of
       continuation characters between the quotation marks.

       Although DEC DATATRIEVE usually converts all lowercase letters
       of your input to uppercase, it preserves lowercase letters in
       character string literals. Because the case of the character
       string literals is preserved, comparisons using these literals
       are case sensitive.