XML and Objects

Mark Baker mark at conveyor.com
Tue Sep 29 15:30:15 BST 1998

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>
> Then reading it back in Java is a case of taking the "CLASS" tag
> and instantiating, then assigning properties.  In C++ it'd need a
> table associating that class with some custom generated C++ stuff.
> Plus of course there are corner cases like wanting to emit strings
> containing characters that are not legal XML -- formfeed, BEL, and
> so on.  (That'd be one reason why when I did such stuff, I didn't
> use DCD.)  Reflection makes stuff like that rather simple to do;
> you can use custom generated code, but don't need to.
> That particular solution doesn't require DOM at all.

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);

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

I think the most important goal of bidirectional Java/XML interop is in going
*from* XML *to* Java, not the other way around.  As such, asking document authors
to follow a Bean-specific DTD isn't such a good idea.  Network effects are your
friend! 8-)


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