Here lists all pages tagged with computer-science or its subtags.

Tags under computer-science are ${query[from index.tag "tag" where string.startsWith(name, "computer-science") select {Tag = name, Page = "["..name.." select {Tag = name, Page = "[["..name..")"}]]}

Pages tagged with computer-science or its subtags are ${template.each(queryfrom index.tag "page" where matchSubTag(tags, "computer-science")), templates.pageItem)}