- All the different ways a single document instance can be modeled -
without changing the markup - by using the parser to essentially
annotate the DAG as it is being generated. Its not a silver bullet - you
definitely still need to do transformations in most cases - but a
surprising number of very useful "views" over the document instance can
be created by just using AF schema annotations.
I suppose you could think of CSS styling in this way, just for display
views, of course. The class attributes function as architectural
annotations, at least in a tiny way.