Where's the line between a document and an app, after all? It's usually the same as the line between code and data. Yes, this line has been crossed before, bu

Where's the line between a document and an app, after all? It's usually the same as the line between code and data. Yes, this line has been crossed before, but the practice is not without downsides one might want to avoid, and so a Turing Complete format like Postscript was supplanted by a static representation of the same drawing model in the form of PDF documents. Word macro viruses may not have done the same to the Doc format, but I still think it should be considered an antipattern.