- <para>Sends Item Update Request. This command sends a "minimal"
- PDU Update to the target supplying the last received record from
- the target.
- If no record has been received from the target this command is ignored
- and nothing is sent to the target.
+ <para>Sends Item Update Request. The <replaceable>action</replaceable>
+ argument must be the action type: one of <literal>insert</literal>,
+ <literal>replace</literal>, <literal>delete</literal> and
+ <literal>update</literal>. The second argument,
+ <replaceable>recid</replaceable>, is the
+ record identifier (any string). Third argument which is optional is
+ the record document for the request. If doc is a quoted string
+ (double quotes) the string content is used verbatim. If doc is not
+ a quoted string, it is assumed to be a filename which is read, then
+ sent as the docuemnt content. If doc is omitted, the last received
+ record (as parf of present response or piggybacked search response)
+ is used for the update.