HTTP uses charset names to indicate or negotiate the character encoding of textual content in representations [RFC6365] Section 3.3.

Character sets may be identified using the value in the IANA Preferred MIME Name column in [IANA Character Sets].

Character sets may also be identified by using the DICOM Defined Terms for the character set (see Annex D, Section C.12.1.1.2 in PS3.3 , and Section 6.1.2.3 “Encoding of Character Repertoires” in PS3.5), which shall be quoted strings since they contain the space (' ') character.

The syntax is:

charset = token / defined-term / DQUOTE defined-term DQUOTE

Where

token

defined-term

The origin server shall support the "UTF-8" charset name for RESTful Retrieve Rendered transaction but is not required to support the DICOM Defined Term "ISO_IR 192". Some DICOM Defined Terms for character sets contain space characters, and shall be enclosed in double quotes in HTTP Header Fields and percent encoded in URIs.

The Conformance Statement shall document all supported character sets. The Retrieve Capabilities response for all RESTful Services shall also document all supported character sets.

A request without any Character Set Query Parameter or Accept-Charset Header Field implies that the user agent will accept any character set in the response.

Annex D contains a mapping of some Specific Character Set (0008,0005) Defined Terms to IANA charset tokens.