XML and Objects
db at Eng.Sun.COM
Thu Oct 1 17:01:31 BST 1998
Jonathan A. Borden wrote:
> Now to your specific question, if objects are represented in this fashion,
> you can access members through interfaces (i.e. Java/C++) through get/set
> pairs. A language XML interface layer is needed. This layer is identical to
> COM's dispatch layer which allows COM objects to be used from within
To a first approximation, a type library in COM corresponds to
a Java "Class" object. Both let you introspect on methods that
are exposed by objects, see interfaces and properties, invoke
methods, and so on. Used with JNI, you get inter-language calling.
(JNI uses "portable C" -- it's not OS-specific.)
> technique takes the SODL document and
> a) generates a typelibrary from it
> b) employs a custom interface which is driven by the SODL document
> The advantage of (a) is that it is compatible with existing software
> however the software is limited to Windows.
Building on that correspondence, one could apply this technique with
Java based systems. A specialized DTD could generate a class file.
Whoops, whoa, don't bother, just use the Java class in the first place...
That is, if you're content to be specific to a given platform (perhaps
Java, perhaps Win32/x86 :-) you can do some very interesting tricks.
BUT ... it may be desirable to design in a platform-neutral way. Not
to ding any particular platform (certainly not Java!); I just want to
point out that when using XML with Objects, there are lots of tradeoffs.
> XML-DEV would be an excellent place to develop an independent (b) layer
> specification. This spec would certainly need to interface with DOM.
xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev at ic.ac.uk
Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/
To (un)subscribe, mailto:majordomo at ic.ac.uk the following message;
To subscribe to the digests, mailto:majordomo at ic.ac.uk the following message;
List coordinator, Henry Rzepa (mailto:rzepa at ic.ac.uk)
More information about the Xml-dev