Does the value for the property
SPListItem can be found in the SharePoint DB or is it a calculated property?
And if it is calculated - then how?
It can be found by calling the
proc_SecGetSecurityInfo stored procedure and getting the
IsScope parameter from the result set.
A flag indicating that the document is the securable object at the root of the scope. [MS-WSSFO3]: Windows SharePoint Services (WSS): File Operations Database Communications Version 3 Protocol