Develop a Webservice

There are many blogs describing how to configure XI to sommunicate with Webservices but so far I have seen none that talk of Developing and Deploying a webservice on XI.

Could someone point me in the direction of a blog or let me know the necessary steps for developing a webservice and the deploying it on XI...

What software can I use... is there any available for free... I would be interested to use the software that Siva Maranani shows in his blog... does anyone know the name of it?

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Ricardo Mendez