There are multiple wikis, blogs, documents and threads discussing MessageTransformBean in details (some of them provided by Vadim Klimov). Please use search function before posting such a basic question, and open a new thread if you had some detailed questions or problems.
MessageTransformBean is a standard adapter module that can be used for various content conversions/transformations execution (e.g. plain format to XML and vice versa). Please check SAP Note 793922 that describes its usage and available parameters. You can also find quite many examples of its usage that are described here, in SCN. Here are just some of them:
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