844b2040_Apache_tm__FOP__Configuration__Description
[Element] strict-validation [Data Type (for the value)] Boolean (true, false) [Default Value] true [Description] 
Setting this option to 'false' causes FOP to be more forgiving about XSL-FO validity, for example, you're allowed to specify a border on a region-body which is supported by some FO implementations but is non-standard. Note that such a border would currently have no effect in Apache FOP.
Apache(tm) FOP: Configuration
Description