Flags may be one of the following values. Flags can be combined using the bitwise OR operator.
cePropFlagNone
0
This is the default value.
cePropFlagBag
134217728
Property is really a property bag
cePropFlagIndex
1073741824
Property value is an index
cePropFlagDirty
536870912
Property value has changed, mark as dirty flag.
cePropFlagReadOnly
-2147483648
Property is read-only. It cannot be updated, but can be deleted.