The DITAVAL format has several elements: val, the root element, can contain a style-conflict element followed by prop or revprop elements; the prop and revprop elements can contain startflag and endflag elements; and the startflag and endflag elements can contain alt-text elements.
Notes on ditaval messages
Conditional processing code should provide a report of any attribute values encountered in content that do not have an explicit action associated with them.
Note on ditaval flagging of images
If an image in DITA content becomes flagged using a background color, the color should be represented as a thick border. If a foreground color is expressed, it should be represented as a thin border.