[ownedbycats]

Thanks

Any ideas why the second part of this template isn't removing the URIs?

program:
	publisher = $publisher;
	ids = $identifiers;
	u = select(ids, 'uri');
	g = select(ids, 'gutenberg');

	if publisher == 'Project Gutenberg' && u != g then
		n = re(u, '^http://www.gutenberg.org/(\d+)', '\1');
		ids = list_union(ids, strcat('gutenberg:', n), ',')
	fi;

	if publisher == 'Project Gutenberg' && u && g then
		ids = list_difference(ids, strcat('uri:', u), ',')
	fi;
	ids