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   Re: XML and Objects

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  • From: Ken MacLeod <ken@bitsko.slc.ut.us>
  • To: xml-dev@ic.ac.uk
  • Date: Tue, 29 Sep 1998 10:02:58 -0500 (CDT)

Mark Baker writes:
> David Brownell wrote:
> >         <BEAN CLASS="com.example.foo.SimpleBean">
> >             <PROPERTY NAME="prop1" DCD:i4>49</PROPERTY>
> >             <PROPERTY NAME="prop2" DCD:string>hello world</PROPERTY>
> >             ...
> >             </BEAN>

> I'd personally like to see Java packages mapped to namespaces in
> some manner, thereby allowing us to do away with Java-specific
> structures, and just stick to the content, ala (ignoring the
> namespace stuff for the moment - I haven't looked at them recently);

> <SimpleBean>
>   <prop1 DCD:i4>49</prop1>
>   <prop2 DCD:string>hello world</prop2>
> </SimpleBean>

It's clear that there are two forms of serialization, and since I'm
not aware of any terms to call them, I'll call them internal and

The first example above is ``external'', the serialization uses a
fixed set of elements, and class and member information is marshaled
as data.  External serialization is generally done using reflection
and introspection, and often doesn't require any class-defined
behavior.  LDO's XML serialization and XML-RPC are examples of the
``external'' form.

The second example above is ``internal'', the serialization uses
class-specific elements, where class and member information are
represented as XML elements.  Internal serialization is generally done
according to the class definition (reflection or IDL), and often
requires a stub or class-specific behavior.  Coins (if I understand
correctly) is an example of the ``internal'' form.

-- Ken MacLeod

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