GetChanges, GetNetworkChanges event_type

[Rod Fitzsimmons Frey]

What are the valid values for the event_type filter on the GetChanges
API calls? My goal is to limit the changes returned to page edits and
additions.

I've tried most of the values returned in the "type" and "op_word"
values returned, for example:

http://xxxxxx.pbworks.com/api_v2/op/GetNetworkChanges/after_hash/5sItZ0pmBm5x/event_filter/page/_type/text
-b net_attassa_wss=xxxxxxx;

http://xxxxxx.pbworks.com/api_v2/op/GetNetworkChanges/after_hash/5sItZ0pmBm5x/event_filter/added/_type/text
-b net_attassa_wss=xxxxxxx;

in all cases I get:

array (
'_auth_role' => 'admin',
'_auth_via' => 'cookie',
'_perm_cache_times' =>
array (
'pagetime' => 1275964371,
'filetime' => 1275518252,
'permtime' => 1275948460,
'foldertime' => 1275518252,
'commenttime' => 1275518252,
'userupdatetime' => 0,
'milestonetime' => 1275948312,
),
'_request_id' => '58485',
'_valid_as_of' => 1276015426,
'error_status' => 500,
'error_string' => 'Invalid event filter \'page\'',
'reference' => 'http://xxxxxx.pbworks.com/api_v2/#GetNetworkChanges',