Developing Services to Integrate Non-ABAP Systems 
You can use data provider services (DPS) that SAP NetWeaver Enterprise Search provides to develop your own services that allow you to integrate non-ABAP systems in SAP NetWeaver Enterprise Search and make it possible to search their data.
On SAP Community Network at http://www.sdn.sap.com/irj/sdn/nw-search, you can find the latest information and documentation for developers, which describes the data provider services (DPS) in SAP NetWeaver Enterprise Search in detail.
Recommendation
In cases in which data providers cannot deliver the complete model or the effort to implement a template services appears greater than the benefit, you should use the XSD-based modeling.
For more information, see: Performing XSD-Based Modelling of DPS Search Models