Différence entre un webservice bottom up et top down?

Salut.
Quand on cré un web service dans eclipse on peut choisir 2 types de web service:
Bottom up et Top down.

http://img695.imageshack.us/img695/4203/webservicey.png

Qu'est ce que cela change de choisir l'un ou l'autre?

Merci

Top Down Web Service Development

The Web service wizard assists you in creating a skeleton bean from an existing WSDL document. The skeleton bean contains a set of methods that correspond to the operations described in the WSDL document. When the bean is created, each method has a trivial implementation that you replace by editing the bean.


Bottom Up Web Service

The Web Service wizard assists you in creating a new Web service, configuring it for deployment, and deploying the Web service to a server. Once your Web service is deployed, the wizard assists you in generating the client proxy and sample application to test the Web service. When you have completed testing, you can publish your Web service to a UDDI Business Registry using the Export wizard.

Ok Merci.

En comparant ces 2 tuto:

Eclipse WTP Tutorials - Creating Bottom Up Web Service via Apache Axis2

Eclipse WTP Tutorials - Creating Top Down Web Service via Apache Axis2

Dans le top down on part du WSDL, il genère des classes (skeleton) dans lesquelles il faut ajouter la logique bussiness.

Alors que dans le bottom up on crée les classes et il génère le WSDL.