RE: Re: If XML is too hard for a programmer, perhaps he'd be b
Data is hard for programmers. XML has made data easier for programmers by giving it a standard, easily processed representation. As Tim points out, it's still harder to deal with XML than with the native structures of any language. For instance, objects are easier for object oriented languages than the XML equivalent that contains the same data. So you wind up working with libraries like the DOM, that seem like one level of indirection off from the business logic, or you wind up using regular expressions with Perl.... Or you use a language that understands XML, like XSLT or XQuery. And if you want to be able to use the XML Schema types, you can import the types into XQuery. Tim dismissed the notion of using an XML-oriented language with two arguments: 1. Tim notes that SQL isn't used for business logic, and asks why XQuery should be different. Well, as Tim points out, you can't implement any serious business logic in SQL. You can in XQuery. I think that makes a difference. Of course, the lack of updates in XQuery 1.0 is an important limitation - and one that will be overcome. 2. Tim says that there is no one data model for XML, and without a data model you can't have a language. As proof, he says: Empirical evidence: I can point to a handful of different popular XML-in-Java APIs each of which has its own data model and each of which works. So why would you think that there's a data model there to build a language around? I find this a strange argument. Each of these APIs depends on having a data model, and demonstrates that data models for XML can be created. A language like XQuery or XSLT also needs to have such a data model, but the fact that another API or language might choose a different datamodel is rather irrelevant. After all, it's possible to have an object oriented programming language even though a different object oriented language would represent the same data in a different way. Jonathan
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