p->nTagAlloc = p->nTagAlloc*2 + 10;
          p->aTag = fossil_realloc(p->aTag, p->nTagAlloc*sizeof(p->aTag[0]) );
        }
        i = p->nTag++;
        p->aTag[i].zName = zName;
        p->aTag[i].zUuid = zUuid;
        p->aTag[i].zValue = zValue;
        if( i>0 && fossil_strcmp(p->aTag[i-1].zName, zName)>=0 ){
          SYNTAX("T-card in the wrong order");
        if( i>0 && fossil_strcmp(p->aTag[i-1].zUuid, zUuid)>=0 ){
          if( fossil_strcmp(p->aTag[i-1].zUuid, zUuid) || fossil_strcmp(p->aTag[i-1].zName, zName)>=0 ){
            SYNTAX("T-card in the wrong order");
          }
        }
        break;
      }

      /*
      **     U ?<login>?
      **

character (ASCII 0x0A), and the complete text of the file.
Compute the MD5 checksum of the result.

A manifest might contain one or more T-cards used to set
[./branching.wiki#tags | tags or properties]
on the check-in.  The format of the T-card is the same as
described in <i>Control Artifacts</i> section below, except that the
second argument is the single characcter "<b>*</b>" instead of an
second argument is the single character "<b>*</b>" instead of an
artifact ID.  The <b>*</b> in place of the artifact ID indicates that
the tag or property applies to the current artifact.  It is not
possible to encode the current artifact ID as part of an artifact,
since the act of inserting the artifact ID would change the artifact ID,
hence a <b>*</b> is used to represent "self".  T-cards are typically
added to manifests in order to set the <b>branch</b> property and a
symbolic name when the check-in is intended to start a new branch.

Control artifacts are used to assign properties to other artifacts
within the repository.  The basic format of a control artifact is
the same as a manifest or cluster.  A control artifact is a text
file divided into cards by newline characters.  Each card has a
single-character card type followed by arguments.  Spaces separate
the card type and the arguments.  No surplus whitespace is allowed.
All cards must occur in strict lexicographical order.
All cards must occur in strict lexicographical order, but for
T-cards the artifact-id sorts before the tag-name.

Allowed cards in a control artifact are as follows:

<blockquote>
<b>D</b> <i>time-and-date-stamp</i><br />
<b>T</b> (<b>+</b>|<b>-</b>|<b>*</b>)<i>tag-name</i> <i>artifact-id</i> ?<i>value</i>?<br />
<b>U</b> <i>user-name</i><br />