task.from(extension.getUserManual().getRoot(), sub -> {
                sub.include("**/*.adoc");
                // Flatten adocs into a single directory
                sub.eachFile(fcd -> fcd.setRelativePath(RelativePath.parse(true, fcd.getName())));
            });

            // From the snippets and the samples, filter out files generated if the build contained was ever executed

            return null;
        }

        String parentPath = childModel.getParent().getRelativePath();
        if (parentPath == null) {
            parentPath = "..";
            childModel.getParent().setRelativePath(parentPath);
        } else if (parentPath.isEmpty()) {
            return null;
        }

        if (source instanceof ModelSource3) {