What is the Importance of Media Types when adding a collection. I saw some configuration like  given below in the WEB-INF/registry.xml file

<mediaTypeHandler>
        <mediaType>application/vnd.apache.axis2</mediaType>         <handler>org.wso2.registry.jdbc.mediatypes.builtin.Axis2RepositoryMediaTypeHandler</handler>

 </mediaTypeHandler>
 

And I couldn't find the "org.wso2.registry.jdbc.mediatypes.builtin.Axis2RepositoryMediaTypeHandler" class in the source code.