Design Questions : File converter tools with extensible , scalable design

I want to design file converter tools where use can say convert text to PDF,CSV ,XML or multiple format . I want to create this design extensible means can support advoc input and output types . It should validate input based on rules. Files should be sorted before starting conversion .

Is this

1. Workflow problem with configurable steps Read -> sort -> validate -> convert to multiple format
2. Is this map reduce problem

Any thoughts on approach ? Is there any open source code available to see ? Any design patterns ?