====== String literals ======
===== Definition =====
==== string_literal ====
  " { graphic_character } "

===== Comments =====
  * A character string must not extend to the following lines as it is a lexical element.
  * Character strings which do not fit into one line can be divided into two or more character strings and be chained or linked to each other. (see the example).
  * '"' within a character string has to be entered as '""'.

===== Examples =====
an error report
<code vhdl>"setup time too small"</code>

an empty character string
<code vhdl>""</code>

three character strings of the length 1
<code vhdl>" " "a" """"</code>

<code vhdl>"Characters such as $, % and } may be contained in character string"</code>

<code vhdl>
"first part of a character string," &
"which only ends on the next line"
</code>