Tech3350 v1.2 specifies that there must be at least 1 region element in a layout element, and in Part 1, that the layout element must be present. Tech3370 relaxes the constraint that layout must be present, but not the constraint that if a layout element exists it must have at least 1 region child. Currently the XSD and code wrongly allows empty layout elements.
Tech3350 v1.2 specifies that there must be at least 1
regionelement in alayoutelement, and in Part 1, that thelayoutelement must be present. Tech3370 relaxes the constraint thatlayoutmust be present, but not the constraint that if alayoutelement exists it must have at least 1regionchild. Currently the XSD and code wrongly allows emptylayoutelements.