“ Ordering is important in these queries: all words following the prefix are included. Caveat: this will only find content if the pages haven't been 'transcluded' into the main page space. This is a known issue. The "all:" prefix searches in all namespaces. ”

“ Custom searches When setting up a large reference work on Wikisource, it is often convenient to have a search box on the front page so that people can search it easily—there may be thousands of separate pages. This is facilitated by the {{engine}} template, which in its default form will search the page it is on and any subpages. It can easily be adapted to search another work. ”