Separation of logical structure and layout structure

Though ODA supports both logical structure and layout structure, they are not completely separated. In order to change the style of a document the logical structure must be edited since the layout process uses the logical structure, the generic structures and the content architectures to create the specific layout. This limitation can be eliminated by carrying over the SGML mechanism of applying different set of layout and presentation styles (or style sheets) for different views of the same logical document.