[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] Re: Mapping: Schema - Java
RE: Mapping: Schema - JavaBox, Don wrote: [ Oliver Becker wrote:] >> >> I wonder if somebody has defined (or even implemented) a mapping >> from XML Schema to Java, i.e. how does Java classes look like which >> can contain data represented in XML and constrained by a XML Schema. >The SOAP/1.0 protocol was designed with exactly this in mind. Check out Section 8 of the SOAP spec >(http://search.ietf.org/internet-drafts/draft-box-http-soap-01.txt). There is a Java/SOAP serializer at > http://www.develop.com/soap. Once I finish my book manuscript on Friday of next week (yippee), I plan on (a) > fixing the pending bugs and (b) adding support for schema<->class compilation. ... >There are a variety of Java-based "data-binding" proposals out there that you ought to look at as well. Koins and > XMOP come to mind, but I am sure there are others. Let me elaborate a bit on this: First (and most important) XML schemas are designed to represent XML documents. It is not clear to me that the XML Schema language is the best way to represent Java (or C++, python, javascript,CLOS etc etc) classes. Though you *can* represent an arbitrary class using an XML Schema, there is no need to use this XML object model for every object in the universe. IDL variants (e.g. CORBA, MSCOM) exist to describe interfaces in a programming language neutral fashion. The design of the XMOP DTD (circa 1998 and hence pre XML Schema) was intended to provide an XML representation of IDL. At first glance, it may seem logical to use the XML Schema definition language to represent Java classes. Is this really so? I submit that the logical "object model" of XML Schema is the DOM. Just as every Java class ought not be an extension of the DOM, an XML description of a Java class need not be done in the XML Schema language. XMOP was designed as a language neutral object serialization/description language. It can be used to pass objects (by value) between javascript, Java and C++/COM systems. I have recently integrated XMOP with SOAP and XML-RPC. The XMOP object description is transformed via XSLT into a downloadable javascript proxy for a SOAP or XML-RPC method call. Versions are included which run under Apache/Tomcat (i.e. Java) and IIS/ASP (i.e. COM). A Cocoon based verion is under development. This dynamic java compilation environment will also allow generation of Java class proxies from XMOP descriptions "on the fly". XML Datatypes are a perfectly valid way to describe Java and C++ etc datatypes and will be incorporated into the next version of the XMOP Schema. If there is interest on the group, I would submit to open the XMOP Schema to an XML-DEV community specification process. A GPL version of the code is available at: http://www.grovelogic.com/xmop/xmop.zip The whitepaper is at http://www.grovelogic.com/documents/xmop.htm Jonathan Borden *************************************************************************** This is xml-dev, the mailing list for XML developers. To unsubscribe, mailto:majordomo@x...&BODY=unsubscribe%20xml-dev List archives are available at http://xml.org/archives/xml-dev/ ***************************************************************************
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