returns xml fragment.
<response success="true" error="">
if success attribute is "true", the document View log has been returned successfully like the sample below.
if success attribute is "false", the error attribute indicates the encountered error.
<response success="true" error="">
<ViewLog>
<Version Number="1000001" UserID="4" Viewer="System Administrator" ViewDate="2007-12-24 16:10:01" />
<Version Number="1000001" UserID="10112" Viewer="Michael York" ViewDate="2007-12-19 14:26:31" />
</ViewLog>
</response>