• Include these codes as defined in http://terminology.hl7.org/CodeSystem/v3-URLScheme version 2.1.0

  Code	Display	Definition
  cid	Content ID	**Description:** cid: is the most common mechanism used in webservices. A cid: reference points from the SOAP body to other content in the mime package in which the SOAP envelope is wrapped
  file	File	Host-specific local file names \[RCF 1738\]. Note that the file scheme works only for local files. There is little use for exchanging local file names between systems, since the receiving system likely will not be able to access the file.
  ftp	FTP	The File Transfer Protocol (FTP) \[RFC 1738\].
  hl7-att	HL7 Attachment	**Description:** A reference to an HL7 attachment by it's identifier, which takes the form hl7-att:\[II.literal\], such as hl7-att:2.1.16.3.9.12345.2.39.3:ABC123
  http	HTTP	Hypertext Transfer Protocol \[RFC 2068\]. http://www.ietf.org/rfc/rfc2068.txt
  mailto	Mailto	Electronic mail address \[RFC 2368\] http://www.ietf.org/rfc/rfc2368.txt
  mllp	MLLP	**Description:** Mimimal Lower Layer Protocol. See Transport Specification: MLLP, Release 2 (HL7 V3 Transport specification).
  nfs	NFS	Network File System protocol \[RFC 2224\]. Some sites use NFS servers to share data files. http://www.ietf.org/rfc/rfc2224.txt
  tel	Telephone	A voice telephone number \[http://www.ietf.org/rfc/rfc3966.txt and http://www.ietf.org/rfc/rfc2806.txt\].
  telnet	Telnet	Reference to interactive sessions \[RFC 1738\]. Some sites, (e.g., laboratories) have TTY based remote query sessions that can be accessed through telnet. http://www.ietf.org/rfc/rfc1738.txt
  fax	Fax	A telephone number served by a fax device \[http://www.ietf.org/rfc/rfc3966.txt and http://www.ietf.org/rfc/rfc2806.txt\].
  modem	Modem	A telephone number served by a modem device \[http://www.ietf.org/rfc/rfc3966.txt and http://www.ietf.org/rfc/rfc2806.txt\].
  x-text-fax	Fax	**Description:** A telephone number served by a fax device \[http://www.ietf.org/rfc/rfc3966.txt and http://www.ietf.org/rfc/rfc2806.txt\]
  x-text-tel	Text Telephone	**Description:** A text telephone - a telephone which is designed for use by the hearing-impaired **Notes:** * x-text-fax is required to replace fax, since this has been deprecated by W3C. * hl7-att is associated with a series of rules that must be followed. These rules are documented in Datatypes R2 * This domain is external and extensible, so documenting this simply clarifies consistent usage for these use cases.

This value set expansion contains 14 concepts.