| Uniform Resource Identifer (URI) Schemes per [RFC4395]
> [RFC4395] defines an IANA maintained registry of URI Schemes. These registries include the Permanent and Provisional URI Schemes. Permanent URI Schemes
> URI Scheme | Description | Reference
> acap | application configuration access protocol | [RFC2244]
> cid | content identifier | [RFC2392]
> crid | TV-Anytime Content Reference Identifier | [RFC4078]
> data | data | [RFC2397]
> dav | dav | [RFC2518]
> dict | dictionary service protocol | [RFC2229]
> dns | Domain Name System | [RFC4501]
> fax | fax | [RFC2806]
> file | Host-specific file names | [RFC1738]
> ftp | File Transfer Protocol | [RFC1738]
> go | go | [RFC3368]
> gopher | The Gopher Protocol | [RFC4266]
> h323 | H.323 | [RFC3508]
> http | Hypertext Transfer Protocol | [RFC2616]
> https | Hypertext Transfer Protocol Secure | [RFC2818]
> im | Instant Messaging | [RFC3860]
> imap | internet message access protocol | [RFC2192]
> info | Information Assets with Identifiers in Public Namespaces | [RFC-vandesompel-info-uri-04.txt]
> ipp | Internet Printing Protocol | [RFC3510]
> iris.beep | iris.beep | [RFC3983]
> ldap | Lightweight Directory Access Protocol | [RFC-ietf-ldapbis-url-09.txt]
> mailto | Electronic mail address | [RFC2368]
> mid | message identifier | [RFC2392]
> modem | modem | [RFC2806]
> mtqp | Message Tracking Query Protocol | [RFC3887]
> mupdate | Mailbox Update (MUPDATE) Protocol | [RFC3656]
> news | USENET news | [RFC1738]
> nfs | network file system protocol | [RFC2224]
> nntp | USENET news using NNTP access | [RFC1738]
> opaquelocktoken | opaquelocktokent | [RFC2518]
> pop | Post Office Protocol v3 | [RFC2384]
> pres | Presence | [RFC3859]
> rtsp | real time streaming protocol | [RFC2326]
> service | service location | [RFC2609]
> sip | session initiation protocol | [RFC3261]
> sips | secure session initiation protocol | [RFC3261]
> snmp | Simple Network Management Protocol | [RFC4088]
> soap.beep | soap.beep | [RFC3288]
> soap.beeps | soap.beeps | [RFC3288]
> tag | tag | [RFC4151]
> tel | telephone | [RFC2806]
> telnet | Reference to interactive sessions | [RFC4248]
> tftp | Trivial File Transfer Protocol | [RFC3617]
> tip | Transaction Internet Protocol | [RFC2371]
> urn | Uniform Resource Names (click for registry) | [RFC2141]
> vemmi | versatile multimedia interface | [RFC2122]
> xmlrpc.beep | xmlrpc.beep | [RFC3529]
> xmlrpc.beeps | xmlrpc.beeps | [RFC3529]
> xmpp | Extensible Messaging and Presence Protocol | [RFC-saintandre-xmpp-iri-04.txt]
> z39.50r | Z39.50 Retrieval | [RFC2056]
> z39.50s | Z39.50 Session | [RFC2056]
> Provisional URI Schemes
> URI Scheme | Description | Reference
> afs | Andrew File System global file names | [RFC1738]
> mailserver | Access to data available from mail servers | [RFC1738]
> tn3270 | Interactive 3270 emulation sessions | [RFC1738]
> Historical URI Schemes
> URI Scheme | Description | Reference
> prospero | Prospero Directory Service | [RFC4157]
> wais | Wide Area Information Servers | [RFC4156]
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