Interactive layout object properties Data form relation For an interactive form, this specifies the link to the form node in the data template tree. By default ddi:form. Data link An XPath linking the layout object to data defined in the Data template. Control type The type of interactive layout object. Read-only. Text type For single-line text input fields, you can specify which type of input that is expected for this field. Validation capabilities are browser dependent. Button type For buttons, select if the button is a Submit, Custom or Reset button. Required Select to set the interactive layout object to be required to specify for the end-user. Read-only Select to disable the interactive layout object for the end-user.