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Strings denote an arbitrary sequence of bytes, usually interpreted as a sequence of UTF-8 encoded characters. Strings in djvused files are similar to strings in the C language. They are surrounded by double quote characters. Certain sequences of characters starting with a backslash ("\") have a special meaning. A backslash followed by letter "a", "b", "t", "n", "v", "f", "r", "\", and stands for the ascii character BEL(007), BS(008), HT(009), LF(010), VT(011), FF(012), CR(013), BACKSLASH(134) and DOUBLEQUOTE(042) respectively. A backslash followed by one to three digits stands for the byte whose octal code is expressed by the digits. All other backslash sequences are illegal. All non printable ascii characters must be escaped.