GetMsgRequest

    <GetMsgRequest> ## GetMsgRequest
        <m id="{message-id}" [part="{msg-part}"] [raw="{want-raw-msg-content} (0|1)"] [read="{mark-read} (0|1)"]
              [max="{max-inlined-length} (Integer)"] [useContentUrl="{use-content-url} (0|1)"]
              [html="{want-defanged-html} (0|1)"] [wantImapUid="{want-imap-uid} (0|1)"]
              [wantModSeq="{want-modified-sequence} (0|1)"] [neuter="{neuter-img-tags} (0|1)"]
              [ridZ="{recurrence-id-YYYYMMDD[ThhmmssZ]}"] [needExp="{need-can-expand} (0|1)"]
              [wantContent="{want-content} (full | original | both)"]> ## MsgSpec
            (<header n="{attribute-name}" /> ## AttributeName)*
        </m>
    </GetMsgRequest>

elements and attributes you can define within a <GetMsgRequest> element:

GetMsgResponse

    <GetMsgResponse> ## GetMsgResponse
        <m [id="{msg-id}"] [i4uid="{imap-uid} (Integer)"] [cif="{X-Zimbra-Calendar-Intended-For}"] [origid="{orig-id}"]
               [rt="{reply-type}"] [idnt="{identity-id}"] [forAcct="{draft-acct-id}"]
               [autoSendTime="{auto-send-time} (Long)"] [sd="{date-header} (Long)"] [rd="{resent-date} (Long)"]
               [part="{part}"] [s="{msg-size} (Long)"] [d="{msg-date} (Long)"] [l="{folder-id}"] [cid="{conversation-id}"]
               [f="{msg-flags}"] [t="{msg-tags}"] [tn="{msg-tag-names}"] [rev="{revision} (Integer)"]
               [md="{msg-date-metadata-changed} (Long)"] [ms="{change-sequence} (Integer)"]> ## MsgWithGroupInfo
            <fr>{fragment} (String)</fr>
            (<e [a="{email-address}"] [d="{display-name}"] [p="{personal name}"] [t="{address-type}"]
                    [isGroup="{email-addr-is-group} (0|1)"] [exp="{can-expand-group-members} (0|1)"] /> ## EmailInfo)*
            <su>{subject} (String)</su>
            <mid>{messageIdHeader} (String)</mid>
            <irt>{inReplyTo} (String)</irt>
            <inv type="{appt-or-task}"> ## InviteWithGroupInfo
                (<tz id="{timezone-id}" stdoff="{timezone-std-offset} (Integer)"
                         dayoff="{timezone-daylight-offset} (Integer)" [stdname="..."] [dayname="..."]> ## CalTZInfo
                    <standard [week="{tzonset-week} (Integer)"] [wkday="{tzonset-day-of-week} (Integer)"]
                                  mon="{tzonset-month} (Integer)" [mday="{tzonset-day-of-month} (Integer)"]
                                  hour="{tzonset-hour} (Integer)" min="{tzonset-minute} (Integer)"
                                  sec="{tzonset-second} (Integer)" /> ## TzOnsetInfo
                    <daylight ... /> ## See /m/inv/tz/standard [ ## TzOnsetInfo]
                  </tz>)*
                (<comp [method="{invite-comp-method}"] [compNum="{invite-comp-num} (Integer)"] [rsvp="{rsvp} (0|1)"]
                           [priority="{invite-comp-priority-0-9}"] [name="{invite-comp-name}"]
                           [loc="{invite-comp-location}"] [noBlob="{no-blob-data} (0|1)"] [fba="{freebusy-actual}"]
                           [fb="{freebusy-status}"] [transp="{transparency}"] [isOrg="{is-organizer} (0|1)"]
                           [x_uid="{x-uid}"] [uid="{uid-for-create}"] [seq="{sequence-num} (Integer)"]
                           [d="{invite-comp-date} (Long)"] [calItemId="{mail-item-id-of-appointment}"]
                           [apptId="{deprecated-appt-id}"] [ciFolder="{cal-item-folder}"] [status="{invite-comp-status}"]
                           [class="{invite-comp-class}"] [url="{invite-comp-url}"] [ex="{is-exception} (0|1)"]
                           [ridZ="{utc-recurrence-id}"] [allDay="{is-all-day} (0|1)"] [draft="{is-draft} (0|1)"]
                           [neverSent="{attendees-never-notified} (0|1)"] [changes="{comma-sep-changed-data}"]> ## InviteComponentWithGroupInfo
                    (<category>{categories} (String)</category>)*
                    (<comment>{comments} (String)</comment>)*
                    (<contact>{contacts} (String)</contact>)*
                    <geo [lat="{longitude}"] [lon="{longitude}"] /> ## GeoInfo
                    (<at [isGroup="{is-group} (0|1)"] [exp="{can-expand-group-members} (0|1)"] [a="{email-address}"]
                             [url="{url}"] [d="{friendly-name}"] [sentBy="{sent-by}"] [dir="{dir}"] [lang="{language}"]
                             [cutype="{calendar-user-type}"] [role="{role}"] [ptst="{participation-status}"]
                             [rsvp="{rsvp} (0|1)"] [member="{member}"] [delTo="{delegated-to}"] [delFrom="{delegated-from}"]> ## CalendarAttendeeWithGroupInfo
                        (<xparam name="{xparam-name}" value="{xparam-value}" /> ## XParam)*
                      </at>)*
                    (<alarm action="{alarm-action}"> ## AlarmInfo
                        <trigger> ## AlarmTriggerInfo
                            <abs d="{YYYYMMDDThhmmssZ}" /> ## DateAttr
                            <rel [neg="{duration-negative} (0|1)"] [w="{duration-weeks} (Integer)"]
                                     [d="{duration-days} (Integer)"] [h="{duration-hours} (Integer)"]
                                     [m="{duration-minutes} (Integer)"] [s="{duration-seconds} (Integer)"]
                                     [related="{alarm-related}"] [count="{alarm-repeat-count} (Integer)"] /> ## DurationInfo
                         </trigger>
                        <repeat ... /> ## See /m/inv/comp/alarm/trigger/rel [ ## DurationInfo]
                        <desc>{description} (String)</desc>
                        <attach [uri="{alarm-attach-uri}"] [ct="{alarm-attach-content-type}"]>{binaryB64Data}</attach> ## CalendarAttach
                        <summary>{summary} (String)</summary>
                        (<at [a="{email-address}"] [url="{url}"] [d="{friendly-name}"] [sentBy="{sent-by}"] [dir="{dir}"]
                                 [lang="{language}"] [cutype="{calendar-user-type}"] [role="{role}"]
                                 [ptst="{participation-status}"] [rsvp="{rsvp} (0|1)"] [member="{member}"]
                                 [delTo="{delegated-to}"] [delFrom="{delegated-from}"]> ## CalendarAttendee
                            (<xparam name="{xparam-name}" value="{xparam-value}" /> ## See /m/inv/comp/at/xparam [ ## XParam])*
                          </at>)*
                        (<xprop name="{xprop-name}" value="{xprop-value}"> ## XProp
                            (<xparam name="{xparam-name}" value="{xparam-value}" /> ## See /m/inv/comp/at/xparam [ ## XParam])*
                          </xprop>)*
                      </alarm>)*
                    (<xprop name="{xprop-name}" value="{xprop-value}"> ... </xprop> ## See /m/inv/comp/alarm/xprop [ ## XProp])*
                    <fr>{fragment} (String)</fr>
                    <desc>{description} (String)</desc>
                    <descHtml>{htmlDescription} (String)</descHtml>
                    <or [a="{email-address}"] [url="{url}"] [d="{friendly-name}"] [sentBy="{sent-by}"] [dir="{dir}"]
                            [lang="{language}"]> ## CalOrganizer
                        (<xparam name="{xparam-name}" value="{xparam-value}" /> ## See /m/inv/comp/at/xparam [ ## XParam])*
                     </or>
                    <recur> ## RecurrenceInfo
                        List of any of: {
                            <add> ## AddRecurrenceInfo
                                List of any of: {
                                    <add> ... </add> ## See /m/inv/comp/recur/add [ ## AddRecurrenceInfo] # [inside itself]
                                    <exclude> ## ExcludeRecurrenceInfo
                                        List of any of: {
                                            <add> ... </add> ## See /m/inv/comp/recur/add [ ## AddRecurrenceInfo] # [inside itself]
                                            <exclude> ... </exclude> ## See /m/inv/comp/recur/add/exclude [ ## ExcludeRecurrenceInfo] # [inside itself]
                                            <except rangeType="{range-type} (int)" recurId="{YYMMDD[THHMMSS[Z]]}"
                                                        [tz="{timezone-name}"] [ridZ="{YYMMDDTHHMMSSZ}"]> ## ExceptionRuleInfo
                                                <add> ... </add> ## See /m/inv/comp/recur [ ## RecurrenceInfo] # [inside itself]
                                                <exclude> ... </exclude> ## See /m/inv/comp/recur [ ## RecurrenceInfo] # [inside itself]
                                             </except>
                                            <cancel rangeType="{range-type} (int)" recurId="{YYMMDD[THHMMSS[Z]]}"
                                                        [tz="{timezone-name}"] [ridZ="{YYMMDDTHHMMSSZ}"] /> ## CancelRuleInfo
                                            <dates [tz="{TZID}"]> ## SingleDates
                                                (<dtval> ## DtVal
                                                    <s [d="{YYYYMMDD['T'HHMMSS[Z]]}"] [tz="{timezone-identifier}"]
                                                           [u="{utc-time} (Long)"] /> ## DtTimeInfo
                                                    <e ... /> ## See /m/inv/comp/recur/add/exclude/dates/dtval/s [ ## DtTimeInfo]
                                                    <dur ... /> ## See /m/inv/comp/alarm/trigger/rel [ ## DurationInfo]
                                                  </dtval>)*
                                             </dates>
                                            <rule freq="{freq}"> ## SimpleRepeatingRule
                                                <until d="{YYYYMMDD[ThhmmssZ]}" /> ## DateTimeStringAttr
                                                <count num="{num} (int)" /> ## NumAttr
                                                <interval ival="{rule-interval} (int)" /> ## IntervalRule
                                                <bysecond seclist="{second-list}" /> ## BySecondRule
                                                <byminute minlist="{minute-list}" /> ## ByMinuteRule
                                                <byhour hrlist="{hour-list}" /> ## ByHourRule
                                                <byday> ## ByDayRule
                                                    (<wkday day="{weekday}" [ordwk="{ord-wk-[[+]|-]num} (Integer)"] /> ## WkDay)*
                                                 </byday>
                                                <bymonthday modaylist="{modaylist}" /> ## ByMonthDayRule
                                                <byyearday yrdaylist="{byyearday-yrdaylist}" /> ## ByYearDayRule
                                                <byweekno wklist="{byweekno-wklist}" /> ## ByWeekNoRule
                                                <bymonth molist="{month-list}" /> ## ByMonthRule
                                                <bysetpos poslist="{bysetpos-list}" /> ## BySetPosRule
                                                <wkst day="{weekday}" /> ## WkstRule
                                                (<rule-x-name [name="{xname-name}"] [value="{xname-value}"] /> ## XNameRule)*
                                             </rule>
                                        }
                                     </exclude>
                                    <except ... > ... </except> ## See /m/inv/comp/recur/add/exclude/except [ ## ExceptionRuleInfo]
                                    <cancel ... /> ## See /m/inv/comp/recur/add/exclude/cancel [ ## CancelRuleInfo]
                                    <dates [tz="{TZID}"]> ... </dates> ## See /m/inv/comp/recur/add/exclude/dates [ ## SingleDates]
                                    <rule freq="{freq}"> ... </rule> ## See /m/inv/comp/recur/add/exclude/rule [ ## SimpleRepeatingRule]
                                }
                             </add>
                            <exclude> ... </exclude> ## See /m/inv/comp/recur/add/exclude [ ## ExcludeRecurrenceInfo]
                            <except ... > ... </except> ## See /m/inv/comp/recur/add/exclude/except [ ## ExceptionRuleInfo]
                            <cancel ... /> ## See /m/inv/comp/recur/add/exclude/cancel [ ## CancelRuleInfo]
                            <dates [tz="{TZID}"]> ... </dates> ## See /m/inv/comp/recur/add/exclude/dates [ ## SingleDates]
                            <rule freq="{freq}"> ... </rule> ## See /m/inv/comp/recur/add/exclude/rule [ ## SimpleRepeatingRule]
                        }
                     </recur>
                    <exceptId d="{DATETIME-YYYYMMDD['T'HHMMSS[Z]]}" [tz="{timezone-identifier}"]
                                  [rangeType="{range-type} (Integer)"] /> ## ExceptionRecurIdInfo
                    <s ... /> ## See /m/inv/comp/recur/add/exclude/dates/dtval/s [ ## DtTimeInfo]
                    <e ... /> ## See /m/inv/comp/recur/add/exclude/dates/dtval/s [ ## DtTimeInfo]
                    <dur ... /> ## See /m/inv/comp/alarm/trigger/rel [ ## DurationInfo]
                  </comp>)*
                <replies>
                    (<reply seq="{sequence-num} (int)" d="{dtstamp} (long)" at="{attendee}" [sentBy="{sent-by}"]
                                [ptst="{participation-status}"] rangeType="{range-type} (int)"
                                recurId="{YYMMDD[THHMMSS[Z]]}" [tz="{timezone-name}"] [ridZ="{YYMMDDTHHMMSSZ}"] /> ## CalendarReply)*
                </replies>
             </inv>
            (<header n="{key}">{value}</header> ## KeyValuePair)*
            List of any of: {
                <mp part="{mime-part-name}" ct="{content-type}" [s="{size-in-bytes} (Integer)"] [cd="{content-disp}"]
                        [filename="{filename}"] [ci="{content-id}"] [cl="{content-location}"] [body="{is-body} (0|1)"]
                        [truncated="{truncated-content} (0|1)"] requiresSmartLinkConversion="(Boolean)"> ## PartInfo
                    <content>{content} (String)</content>
                    (<mp> ... </mp> ## See /m/mp [ ## PartInfo] # [inside itself])*
                 </mp>
                <shr [truncated="{truncated-flag} (0|1)"]> ## ShareNotification
                    <content>{content} (String)</content>
                 </shr>
                <dlSubs [truncated="{truncated-flag} (0|1)"]> ## DLSubscriptionNotification
                    <content>{content} (String)</content>
                 </dlSubs>
            }
            <content [url="{url}"]>{value}</content> ## UrlAndValue
            (<meta [section="{section}"]> ## MailCustomMetadata
                (<a n="{key}">{value}</a> ## See /m/header [ ## KeyValuePair])*
              </meta>)*
         </m>
    </GetMsgResponse>

elements and attributes you can define within a <GetMsgResponse> element:

     X-FOO-HELLO;X-FOO-WORLD=world:hello
 

     <xprop name="X-FOO-HELLO" value="hello">
         <xparam name="X-FOO-WORLD" value="world"/>
     </xprop>
 

     YYYY - 4 digit year
     MM   - 2 digit month
     DD   - 2 digit day
 Optionally:
     'T' the literal char "T" then
     HH - 2 digit hour (00-23)
     MM - 2 digit minute (00-59)
     SS - 2 digit second (00-59)
     ...and finally an optional "Z" meaning that the time is UTC,
     otherwise the tz="TIMEZONE" param MUST be specified with the DATETIME
     e.g:
         20050612  June 12, 2005
         20050315T18302305Z  March 15, 2005 6:30:23.05 PM UTC
 

     YYYY - 4 digit year
     MM   - 2 digit month
     DD   - 2 digit day
 Optionally:
     'T' the literal char "T" then 
     HH - 2 digit hour (00-23)
     MM - 2 digit minute (00-59)
     SS - 2 digit second (00-59)
     ...and finally an optional "Z" meaning that the time is UTC,
     otherwise the tz="TIMEZONE" param MUST be specified with the DATETIME
     e.g:
         20050612  June 12, 2005
         20050315T18302305Z  March 15, 2005 6:30:23.05 PM UTC