| Value | Description | Notes | Issue number | Modified in Issue |
|---|---|---|---|---|
| 02 | HTML | Other than XHTML | 0 | 2 |
| 03 | XML | Other than XHTML | 0 | 2 |
| 05 | XHTML | 2 | ||
| 06 | Default text format | Default: plain text containing no markup tags of any kind, except for the character entities & and < that XML insists must be used to represent ampersand and less-than characters in textual data, and in the encoding declared at the head of the message or in the XML default (UTF-8 or UTF-16) if there is no explicit declaration | 4 | 49 |
| 07 | Basic ASCII text | Plain text containing no markup tags of any kind, except for the character entities & and < that XML insists must be used to represent ampersand and less-than characters in textual data, and with the character set limited to the ASCII range, i.e. valid characters whose Unicode character numbers lie between 32 (space) and 126 (tilde) | 4 | 49 |