Data Sync 3.0 is now shipping with a generic Xml Provider where you can turn any simple XML Feed into a Data Source and Sync to SQL, Oracle, OleDB, SharePoint etc.
Suppose you have an XML Feed like this something simple that represents rows and columns.
Simply connect it to data sync with the XML File provider
Specify the XPath expression to each node (column) you want to return
Hey presto one Xml Data Source ready for syncing....