Filters out any results whose data is not equal to or less than the supplied parameter, ie it works exactly like the "=<" operator.

RecursiveLayoutfolder

RecursiveDamcatalogfolder
RecursiveUserfolder
IsDescendantOf

Works exlusively with data, which is an SQL hierarchy ID. Filters out any results, which are not descendants.

Filters out results, whose data is or an empty string.

Filters out results, whose data is not null or an empty string.

The same as Empty, except that this filter will not be applied, if the user does not supply a parameter.

The same as NotEmpty, except that this filter will not be applied, if the user does not supply a parameter.