[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Feasibility of "do all application coding in the XML langu
> Hi Roger, > There are many software applications, which need > imperative programming infrastructure (where we should be > able to change program state at will, like using assignment > statement as so on). > >1. Complex business logic (say I am implementing a work flow for an insurance company) >2. Game programming :) >3. GUI programming > To my opinion, none of the above tasks can be done (or easily > done) in XML based languages. There are no applications that NEED imperative programming (functional programming has provably the same computational power). Whether things are more EASILY done that way is in large measure a matter of your skills and experience. (I remember working with programmers from an older generation who claimed coding was easier if they used GOTO statements.) There are one or two things I still find easier in imperative languages - notably some graph-walking applications - but they are few and far between. Many problems that appear to be so complex that you need an imperative language turn out, on examination, to be complex only BECAUSE you are using an imperative language. Of your three examples, one of my clients builds complex workflow applications entirely in XSLT/XQuery and it's remarkable how the logic is simplified by doing it this way. One of the attractions is that a functional language like XSLT or LISP encourages you to think about program and data in a more unified way, which is really helpful when building a workflow engine. For example, it's natural to think about a set of rules written in an XML vocabulary being translated dynamically into an XSLT stylesheet. Game programming and GUI programming are a different question because your choice of language is heavily dictated by the data you are working with. XML languages are good at manipulating XML, they are not so good at manipulating images. But functional languages such as Haskell are certainly used for implementing "strategy" games such as chess. Michael Kay http://www.saxonica.com/
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