The general interpretation of this attribute allows demarcation portion of data entry screen into groups. The common use of this involves validation groups. For instance, the elements involved in the credit card entry would be validated separately from the order line entries. This could imply that the order could be modified and saved with the click on the save button. Or else, credit card entered and pay button clicked. The save button should not cause validation of the credit card entries; in most cases this could cause validation errors. The order elements would be in one validation group, and the credit card in another.