You can nest groups of expressions within a filter. Each expression in a filter group shares the same top-level operator (that is,
NOT OR), and the results of the group are treated like an expression for the group above it.
Group level can be determined by the indentation of the group and its expressions — those expressions to the left are higher-level groups than those to the right.
The following filter indicates that files whose data is displayed in the portlet must
NOT be both initialized
AND either from Dell
OR from Microsoft. The
OR group is at the same level as the Initialized expression, and the
NOT AND group contains everything in the filter.