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Subject Re: XML and web services
Date Tue, 29 Oct 2002 19:41:05 GMT

Doesn't this all seem complex compared to just supporting an XML datatype?

For a number of the Weblogic services I've created I used things like:

- <message name="fetchAdvisorListRequest">
        <part name="arg0" type="dom:org.w3c.dom.Document" />
- <message name="fetchAdvisorListResponse">
        <part name="return" type="dom:org.w3c.dom.Document" />

As you can see, the endpoint takes a single argument in and sends a single
argument back - just XML docs.

This makes it easy to send pretty complex data structures over the wire.
For example, one app we created had an XML element called <Command> that we
used to implement a 'Command Pattern' for the web service. The <Command>
value was passed to a factory class that returned a parser that knew what
to expect in that particular XML document. We created upwards ot 20
commands for the project - all with widely varying XML content - and we had
to implement only a single web service endpoint. Plus all the data was
readable text when monitored using tcpmon.

I know that another department connected to one of the services using some
MS technologies - though I don't know the details - and was able to process
things with no problem.

This seems to me to be a much simpler way to build web services than to
create a bunch of different services and endpoints and have to have
different datatypes (and potentially custom handlers).


James Black <> on 10/29/2002 01:26:41 PM

Please respond to

cc:     (bcc: Kevin Bedell/Systems/USHO/SunLife)
Subject:    Re: XML and web services

Ricky Ho wrote:

> Besides the performance overhead of converting the XML to a byte array
> back, another big minus is the WSDL in this case has lost all the schema
> definition.  In other words, the client and the server has to use another
> channel to communicate what does the detail of the request and response
> look like.

  That is why one parameter that the client sends is to tell the server how
return the data.

  For my purposes this works well, since the output can vary so much.  For
others it may not be as useful.
  I am also on a 100Mb network, and so bandwidth is not a concern. <g>

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