Xpath
/control/member-list[@sync-mode]
Possible values
add
replace
replace_keep_bounces
sync
sync_update_attributes
sync_update_attributes_no_add
delete
add
add_update
update
add_mode
add_member_mode
add_update_mode
add_user_update_mode
update_mode
replace_mode
delete_mode
For more information check https://help.mapp.com/Help.en_GB/Help.htm#import-contacts-window.htm#ID_6cd99b6eb12dd6e4c0a8428300e934f5-36064568d2237e24c0a842830016ce0f-en-GB
Example
<member-list sync-mode="add">
Error response
<faultstring>at line 2, column 112: cvc-enumeration-valid: Value 'addreplace' is not facet-valid with respect to enumeration '[add, invite, add_no_message]'. It must be a value from the enumeration.</faultstring>