RE: XML Object Serialization
How is an application which 'compiles' classes really different from an interpreted implementation (ex. ASP)? If the XML doc changes so much it 'breaks' the former then is rational to expect it to 'break' the latter, too? </pff> -----Original Message----- From: Jeff Lowery [mailto:jlowery@s...] Sent: Tuesday, October 29, 2002 12:26 PM To: 'Anthony B. Coates'; xml-dev Subject: RE: XML Object Serialization > Sure, and I've seen enormous problems come out of people > "compiling" XML > schemas into classes using the tools that are now available. > I mean, one of the > main reasons for using XML is to decouple applications, and > then people compile > the XML schemas into code so that they tightly couple their > applications to this > week's version of the XML. It can cause *huge* delays for > projects. People > don't seem to remember that if you tightly couple some of > your code to the XML, > you need to loosely couple those bits of code to the rest of > your application. How about instead of generating classes, these code generators generated interfaces + implementations? Still not perfect, but at least you're coding your app to an interface. You can then change the interface, either through extension or dynamic proxies. The implementation classes can also be extended, or rewritten altogether if needs be. There are still versioning issues, but I think by coding to interfaces you reduce the impact of minor version changes. For instance, you can sometimes temporarily mask datatype changes by keeping the interface the same and doing appropriate casting in an extended class of the generated implementation; it allows the rest of the app code some time to catch up to the latest schema change. ----------------------------------------------------------------- The xml-dev list is sponsored by XML.org <http://www.xml.org>, an initiative of OASIS <http://www.oasis-open.org> The list archives are at http://lists.xml.org/archives/xml-dev/ To subscribe or unsubscribe from this list use the subscription manager: <http://lists.xml.org/ob/adm.pl>
PURCHASE STYLUS STUDIO ONLINE TODAY!
Purchasing Stylus Studio from our online shop is Easy, Secure and Value Priced!
Download The World's Best XML IDE!
Accelerate XML development with our award-winning XML IDE - Download a free trial today!
Subscribe in XML format