RE: [xml-dev] Must databinding imply tight coupling? (was Re: New tool for handlingXML in Java)

> -----Original Message-----
> From: Jeff Lowery [mailto:] 
> Sent: Thursday, February 13, 2003 12:41 PM
> To: Dare Obasanjo; Mike Champion; 
> 
> >      double PEratio = (double)
> >        doc.CreateNavigator().Evaluate("/*/price div 
> > (/*/revenues - /*/expenses)");     
> >  
> >      Console.WriteLine("PE Ratio = {0}", PEratio);      
> 
> This looks better, but:
> 
> 1) what if a field is mispelled?
> 2) what if an operator is undefined for the field value?
> 3) what if the cast is invalid for the value returned?
> 
> All these errors are caught at runtime, whereas in the 
> binding example, such errors occur at compile-time.  That's a 
> big, big win for data binding using schema definitions.  

This assumes data binding in a statically typed language which seems to
me to imply overly tight coupling. However given the popularity of
Object<->XML binding technologies it seems that most developers would
forego the loose coupling that many would consider a benefit of XML to
gain an easier processing model. 

-- 
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