'ftp scheme for File Transfer Protocol services': {|xml|| ftp://ftp.is.co.za/rfc/rfc1808.txt |}. 'gopher scheme for Gopher and Gopher+ Protocol services': {|xml|| gopher://spinaltap.micro.umn.edu/00/Weather/California/Los%20Angeles |}. 'http scheme for Hypertext Transfer Protocol services': {|xml|| http://www.math.uio.no/faq/compression-faq/part1.html |}. 'mailto scheme for electronic mail addresses': {|xml|| mailto:mduerst@ifi.unizh.ch |}. 'news scheme for USENET news groups and articles': {|xml|| news:comp.infosystems.www.servers.unix |}. 'telnet scheme for interactive services via the TELNET Protocol': {|xml|| telnet://melvyl.ucop.edu/ |}. 'wrong URI'(fail): {|xml|| :ftp |}. 'URI IPv6': {|xml|| ldap://[2001:db8::7]/c=GB?objectClass?one |}. 'tel': {|xml|| tel:+1-816-555-1212 |}. 'telnet #2': {|xml|| telnet://192.0.2.16:80/ |}. 'https': {|xml|| https://john.doe@www.example.com:123/forum/questions/?tag=networking#top |}. 'https fail'(fail): {|xml|| https:#john.doe@?:123/forum/questions/?tag=networking#top |}. 'missing scheme'(fail): {|xml|| //example.com |}.