Sure!
Inside a Relevance String literal, the percent sign indicates a percent-encoded ASCII value (in hexadecimal). 22 is the hexadecimal value for the doublequotes symbol, so %22 is a replacement for doublequotes (you can’t use a literal doublequotes inside the string, as that would terminate the string).
Similarly if you need a literal percent symbol, you’d replace that with %25 (the ASCII code for ‘%’).
You can perform percent-encoding on any string, like in a URL-encoding, where for example %20 is the symbol for a whitespace.
