I\'ve done a asp.net application to generate reports over a particular data. Initially i created local reports (.rdlc) to generate reports. I created separate .xsd for each rdlc
What are you trying to do? I believe the datasource is mentioned within the .RDL file itself.
For ex: When you create an Report using BIDS, you can specify the datasource. This gets added to the .RDL file. The same concept holds true here as well.