Mapping XML Data to CRM Entities

I have the following requirements which I need to do real time so I guess SSIS is out.

1. I have a code that gets triggered when an XML arrives into our file system.  The XML maps to an entity type in CRM.  As soon as the XML arrives I am required to parse this XML and create a new instance of the entity that the XML represents.
2. The XML coming in could represent different entity types, based on an attribute in the XML I can decide which entity type to populate.

So my question is

Is there any tool out there which I can use to map XML's to CRM entities and use it to create a new instance of an entity as soon as an XML comes?