In the old days, you could export the content in developer mode (external .analyticview file, which would be a well-formed XML) and then, in the file's content, replace manually all references to the old schema to the new schema.
In the latest revisions (since SP5? maybe before, not sure), they've released the schema mapping functionality, which doesn't require you to do that replacement manually anymore.
Check item "7.1.6 Mapping the Authoring Schema to the Physical Schema" of the HANA Developer Guide: http://help.sap.com/hana/hana_dev_en.pdf