IBATIS.NET - V3- Gets the IDataMapper from an IMapperFactory looks very strange

[Yaojian]

The Apache.Ibatis.DataMapper.DefaultMapperFactory does not implement the
IMapperFactory.GetMapper<TInterface>();

so the only way AFAIK to get the IDataMapper is to use a type cast as:

            IMapperFactory mapperFactory =
configurationEngine.BuildMapperFactory();
            IDataMapper dataMapper =
((IDataMapperAccessor)mapperFactory).DataMapper;   //since GetInterface<T>
has not been implemented.

Any one have idea about what the GetInterface<T> intend to be?