The type element does not have any child elements, but instead should contain a string value. Furthermore, the applicable string values depend on the context of this type element: either the child of a cluster or the child of a question.
In the context of a cluster, use "flow" as the layout type if the labels should be displayed to the left of input controls or values, or "compact-flow" if the labels should be displayed above the input controls or values.
In the context of a question, use "radio" as the layout type if the question has a codetable as its data type and the possible answers should be displayed as a group of radio buttons to the side of the question label. Use "radio-indent" as the layout type if the question has a codetable as its data type and the possible answers should be displayed as a group of radio buttons underneath the question label and tabbed in from the side. The "radio-indent" layout type should only be used in clusters that have one column.