To add an attribute filter, select Add Filter action label and then enter a valid attribute in the displayed field. Click in the Operator field and accept the suggested Operator or select a different one from the drop-down list. With the Operator selected, click in the Value field and enter an appropriate value. Accepting these settings enters them in the filter grid.

The In the List Operator enables you to specify a list of values (separated by spaces) for the specified attribute value - these can be numeric or non-numeric, depending on the type of the attribute. For example, Attribute=AREA, Operator="In the List", Value="0 1 3", would find items which have AREA attribute equal to either 0 or 1 or 3.

The In the Range Operator enables you to specify a range of 2 numeric values for example an upper and a lower limit, inclusive. So, for example, Attribute=AREA, Operator="In the range", Value="1 10", would find items which have AREA attribute equal to any numeric value between and including 1 and 10.

If the attribute is changed once it is in the grid, then the Operator and Value fields update accordingly.