Until version 1.4 it was not possible to rewrite the URL-part of an object summary. It is now possible, but only by using the ``pipe'' instruction. This may be useful for people wanting to run a Gatherer on file:// URLs, but have them appear as http:// URLs. This can be done with a post-summarizing rule such as:
url ~ 'file://localhost/web/htdocs/'
url | fix-url.pl
And the 'fix-url.pl' script might look like:
#!/usr/local/bin/perl -p
s'file://localhost/web/htdocs/'http://www.my.domain/';