Use the following syntax to specify the patternStyle attribute:
patternStyle="enumeration"
where enumeration is one of: none | dots | checks | small-box | med-box | large-box | vert-line | wide-vert-line | horz-line | wide-horz-line | right-diag | wide-right-diag | left-diag | wide-left-diag | hatch | bricks | ovals | diamonds | scales | waves