Data filter � convenient tool used dudring the creation of sitemap, which allows along with page URL to specify the following important data for search engines: priority of particular pages in relation to other website pages and updating mode.
Additionally, filter allows excluding particular pages from the crawl process, which are not needed in the Sitemap file.
Data filters can be applied either for separate pages (for this you need to input full URI of the pages), or for groups of the pages (for this you need to input a part of URL, which corresponds to all similar pages. For example: ".jpg" or "/directory/files").