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[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] RE: Alternatives to browsers (was Re: Alternatives to the W3C)
 Hi Tim, Tim said: Nobody would call it preferable in the general case. The story I keep hearing is that in comparison with XML, HTTP, string, and glue, frameworks like CORBA and RMI offer you, say N times as much (security, transaction semantics, etc), but cost M times as much time & money to deploy. In some application contexts the relative values of M and N would predispose you toward CORBA, in others towards using XML. If there's an underlying lesson, it's that the Web is all about doing a lot with a little; the HTML/HTTP/URI trio have to count as one of the great 80/20 point bullseyes in the history of technology. With XML messaging and HTTP piping, you can sometimes do a whole lot remarkably quickly. Doesn't mean CORBA's obsolete. DCOM, maybe. -T. Didier reply: Does not mean that DCOM is dead either. In fact, the good question to ask is what is CORBA and DCOM after all, and is the difference between CORBA and DCOM? Q: what is CORBA and DCOM after all? A: CORBA: an interface definition format named IDL. a marshalling convention named IIOP. The notion of encoding-decoding with the usage of stubs (that encode and decode from programming language into the marshalling format). DCOM: an interface definition format named IDL but different from CORBA (in fact based on a previous consortium name OSF). A marshalling format based on the OSF RPC marshalling format. the notion of encoding-decoding with the usage of stubs (in fact named in this case proxy and stub - both used to encode and decode from the marshalling format into a programming language). CORBA is available as free software (IDL compiler, run time ORB etc.) and as product. It is, I also bundled with the Gnome package and any Linux package that include GNOME. DCOM is bundled in the 150 millions copies of Windows and is also available (bug yet buggy) as free software (the WINE project). Could also be obtained as free software for the Unix/Linux platform (re: Software AG) and available as product. Q:What is the difference? R: the IDL and how objects/interfaces are structured. DCOM includes a binary interface definition and thus allows true inter-operability between components even created with different languages to work together. Thus, components could be used intra-address space (without marshalling) or inter-address space (with marshalling) CORBA only include an inter-address space mechanism and has no binary interface convention. Q: what would be the best world? That both CORBA and DCOM provide an IDL to an XML based marshaler. This way, at least, two components (a) a CORBA one and (b) a DCOM one could be made to inter-operate if both also use HTTP as a transport mechanism. Will DCOM disappear? Come one Tim, get out of your home :-) How to make disappear 150 million windows just to say dip a dip doo? and bang it all disappear with a touch of a magic wand? So DCOM is here to stay as long as window as a comfortable market share. Will CORBA increase its market share? yes if all Linux package bundle the same ORB. Will CORBA get a bigger market share than DCOM? only if all Linux packages does (a) bundle the same ORB, (b) increase their market share. (b) is happening, (a) is not, the Linux world is not an homogeneous one, there are several resellers and packagers that obviously are trying to differentiate and play, in certain ways, the same game as Microsoft does (try to get their customers captive). What is the advantages of both DCOM and CORBA? have an interface definition language that allows you to compile it and create a mapping for a particular language. You then created a meta language for procedural or non procedural languages. It resolves the impedance mismatch between components and allows the development by components instead of re-inventing the wheel each time. What W3C could do to really help us create inter-operable apps? forget about the IDL and crusade about CORBA. Just focus on the marshalling format and do a recommendation for the marshalling format and transport mechanism. Get in the WG representative from Microsoft, the OMG consortium and the Linux community (are there any Linux packager part of the W3 consortium?) and get them agree on a common marshalling and transport format. Believe me, we'll have accomplished a lot toward inter-operability of applications. What is in the way to make that happen? Simply the will of somebody to put that on the W3C agenda. Cheers Didier PH Martin ---------------------------------------------- Email: martind@n... Conferences: Web New York (http://www.mfweb.com) Book to come soon: XML Pro published by Wrox Press Products: http://www.netfolder.com xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ or CD-ROM/ISBN 981-02-3594-1 Please note: New list subscriptions now closed in preparation for transfer to OASIS. 
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