[docbook-apps] Annotating program listings - Callouts - Chapter 27. Program listings - minor / nit typo ?

[Robert Lucente]

url: http://www.sagehill.net/docbookxsl/AnnotateListing.html#Callouts

The program listing has

virtual int  parse(MyFetch &fetcher) = 0;

I think that "&amp" is a typo in the above line of code ? 

This has probably already been found but just in case.