The flexibility of Magento Dataflow module lies in fact you can easily create your own adapters, parsers, mappers and apply them to your specific dataflow needs.
The basic case you may wonder how to do, is import of data for your custom module. Let’s do this by example. Imagine you need to display on you e-shop list of stores, you have created custom module, table in database and datamodel part, all you need now is to populate this table with data you have within csv file.
Read the file
First you have to read the file. As you already know (if you read Magento Dataflow – Default Adapters ) you can use dataflow/convert_adapter_io adapter for this.