Allowed cards in the manifest are as follows:

<blockquote>
<b>B</b> <i>baseline-manifest</i><br>
<b>C</b> <i>checkin-comment</i><br>
<b>D</b> <i>time-and-date-stamp</i><br>
<b>F</b> <i>filename</i> <i>SHA1-hash</i> <i>permissions</i> <i>old-name</i><br>
<b>N</b> <i>mimetype</i>
<b>P</b> <i>SHA1-hash</i>+<br>
<b>Q</b> (<b>+</b>|<b>-</b>)<i>SHA1-hash ?SHA1-hash?</i><br>
<b>R</b> <i>repository-checksum</i><br>
<b>T</b> (<b>+</b>|<b>-</b>|<b>*</b>)<i>tag-name  <b>*</b> ?value?</i><br>
<b>U</b> <i>user-login</i><br>
<b>Z</b> <i>manifest-checksum</i>
</blockquote>

defined is "x" which means that the file is executable.  All files are
always readable and writable.  This can be expressed by "w" permission
if desired but is optional.  The file format might be extended with
new permission letters in the future.
The optional 4th argument is the name of the same file as it existed in
the parent check-in.  If the name of the file is unchanged from its
parent, then the 4th argument is omitted.

A manifest has zero or one N-cards.  The N-card specifies the mimetype for the
text in the comment of the C-card.  If the N-card is omitted, a default mimetype
is used.

A manifest has zero or one P-cards.  Most manifests have one P-card.
The P-card has a varying number of arguments that
defines other manifests from which the current manifest
is derived.  Each argument is an 40-character lowercase 
hexadecimal SHA1 of the predecessor manifest.  All arguments
to the P-card must be unique to that line.

cards by newline characters.  The format of each card is as in
manifests, clusters, and control artifacts.  Wiki artifacts accept
the following card types:

<blockquote>
<b>D</b> <i>time-and-date-stamp</i><br />
<b>L</b> <i>wiki-title</i><br />
<b>N</b> <i>mimetype</i><br />
<b>P</b> <i>parent-artifact-id</i>+<br />
<b>U</b> <i>user-name</i><br />
<b>W</b> <i>size</i> <b>\n</b> <i>text</i> <b>\n</b><br />
<b>Z</b> <i>checksum</i>
</blockquote>

The D card is the date and time when the wiki page was edited.
The P card specifies the parent wiki pages, if any.  The L card
gives the name of the wiki page.  The optional N card specifies
the mimetype of the wiki text.  If the N card is omitted, the
mimetype is assumed to be text/x-fossil.  
The U card specifies the login
of the user who made this edit to the wiki page.  The Z card is
the usual checksum over the either artifact and is required.

The W card is used to specify the text of the wiki page.  The
argument to the W card is an integer which is the number of bytes
of text in the wiki page.  That text follows the newline character
that terminates the W card.  The wiki text is always followed by one

the attachment is connected (the target artifact).
The following cards are allowed on an attachment artifact:

<blockquote>
<b>A</b> <i>filename target</i> ?<i>source</i>?<br />
<b>C</b> <i>comment</i><br />
<b>D</b> <i>time-and-date-stamp</i><br />
<b>N</b> <i>mimetype</i><br />
<b>U</b> <i>user-name</i><br />
<b>Z</b> <i>checksum</i>
</blockquote>

The A card specifies a filename for the attachment in its first argument.
The second argument to the A card is the name
of the wiki page or ticket or event to which the attachment is connected.  The
third argument is either missing or else it is the 40-character artifact 
ID of the attachment itself.  A missing third argument means that the
attachment should be deleted.

The C card is an optional comment describing what the attachment is about.
The C card is optional, but there can only be one.

A single D card is required to give the date and time when the attachment
was applied.

There may be zero or one N cards.  The N card specifies the mimetype of the
comment text provided in the C card.  If the N card is omitted, the C card
mimetype is taken to be text/plain.

A single U card gives the name of the user to added the attachment.
If an attachment is added anonymously, then the U card may be omitted.

The Z card is the usual checksum over the rest of the attachment artifact.
The Z card is required.

checkpoints, or news articles.
The following cards are allowed on an event artifact:

<blockquote>
<b>C</b> <i>comment</i><br>
<b>D</b> <i>time-and-date-stamp</i><br />
<b>E</b> <i>event-time</i> <i>event-id</i><br />
<b>N</b> <i>mimetype</i><br />
<b>P</b> <i>parent-artifact-id</i>+<br />
<b>T</b> <b>+</b><i>tag-name</i> <b>*</b> <i>value</i><br />
<b>U</b> <i>user-name</i><br />
<b>W</b> <i>size</i> <b>\n</b> <i>text</i> <b>\n</b><br />
<b>Z</b> <i>checksum</i>
</blockquote>

The C card contains text that is displayed on the timeline for the
event.  Exactly one C card is required on an event artifact.

A single D card is required to give the date and time when the 
event artifact was created.  This is different from the time at which
the event occurs.

A single E card gives the time of the event (the point on the timeline
where the event is displayed) and a unique identifier for the event.
When there are multiple artifacts with the same event-id, the one with
the most recent D card is the only one used.  The event-id must be a
40-character lower-case hexadecimal string.

The optional N card specifies the mimetype of the text of the event
that is contained in the W card.  If the N card is omitted, then the
W card text mimetype is assumed to be text/x-fossil, which is the
Fossil wiki format.

The option P card specifies a prior event with the same event-id from
which the current event is an edit.  The P card is a hint to the system
that it might be space efficient to store one event as a delta of the
other.

An event might contain one or more T-cards used to set

<td align=center><b>X</b></td>
<td align=center>&nbsp;</td>
<td align=center>&nbsp;</td>
<td align=center>&nbsp;</td>
<td align=center>&nbsp;</td>
<td align=center>&nbsp;</td>
</tr>
<tr>
<td><b>N</b> <i>mimetype</i></td>
<td align=center><b>X</b></td>
<td align=center>&nbsp;</td>
<td align=center>&nbsp;</td>
<td align=center><b>X</b></td>
<td align=center>&nbsp;</td>
<td align=center><b>X</b></td>
<td align=center><b>X</b></td>
</tr>
<tr>
<td><b>P</b> <i>uuid ...</i></td>
<td align=center><b>X</b></td>
<td align=center>&nbsp;</td>
<td align=center>&nbsp;</td>
<td align=center><b>X</b></td>
<td align=center>&nbsp;</td>