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The biggest difference that I find is that Castor
uses XSD and from what people tell me JAXB uses DTD. Beyond that, Castor
is fairly easy to use (once I realized that you need to make sure all classes
are compiled as for each complexType there is an extra class that is not
directly accessed (that is Forte did not realize that it needed to be
compiled)).
----- Original Message -----
Sent: Tuesday, April 16, 2002 3:35
PM
Subject: RE: XML to XSD
JAXB
gets incrementally more complex the more you have to override default
translation,
but if you're
willing to accept the default, it's only as complex as three lines of
descriptor
per XML
schema. Does Castor give you any control over the binding to java classes at
all?
If so, how does it
avoid the complexity of JAXB? If not, how does it differ from JAXB
in
default
mode?
Thanks,
Walden
I would recommend using Castor from Exolab to deal
with XML and Schemas. JAXB is too complex since it tries to redefine what
Schema already defines (constraints, type, ....). Using Castor, you will be
able to generate the java framework starting from one file: your schema
!
A tool creating Schema from XML is nearly impossible due to the
semantic information which does not show in an XML document. For this reason
using DTD is useless, and JAXB once again is too complex.
I would
recommend XML Spy which helps you creating a Schema from an existing XML,
then you can tweak it to refine your rules.
Once finished, you just take
the schema, call sourceGen from the exolab distribution and.... Voila !
Just to add to the polemic, it seems that SUN's future on JAXB is
unclear. I have heard from other SUN engineers that the project might be
re-architected. Anyway SUN's direction for J2EE 1.4 is to move to Schemas,
allowing standard checking from the parser and be able for some vendors to
extend some configurations (I am sure that iPlanet is going to like
it......).
Olivier
Adam Greene wrote:
000d01c1e56d$6dcd4690$688fb3cf@adam">
Thanks. I will look into JAXB (I can
get DTDs without any problems from Forte (it creates them from the
XML)).
-----
Original Message -----
Sent:
Tuesday, April 16, 2002 10:42 AM
Subject:
RE: XML to XSD
Note the difference between "XML schema" and
"XML Schema". The former includes DTDs and XML Schemas. I don't believe
JAXB currently works with XML Schemas, only DTDs.
Sun has JAXB (Java Architecture for XML Binding) that compiles
an XML schema into
java
classes. It's in early release form, and it only supports DTD
schema now, although
their docs
say they intend to support W3C schema sometime
soon.
JAXB is
interesting in that you can control the way java classes are generated
by writing
a binding
descriptor that overrides the compiler's assumptions, pay as you
go. Don't know
if this
product has a future, though.
Does anyone know of a good (and free)
program that would help one create an XML Schema from an XML
file. I'm still kind of new to all these different XML formats
(DTD, XML, XSD, WSDL, and the list goes on), but I want to use
Castor to create classes for loading and saving XML and it wants to
start with an XSD. Or as a another possibility an XML to Java
maker / compiler. Does Xerces have one (like Xalan has the
XSLT compiler)??
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