Not sure exactly what specifics you are looking for? The AC-LH code/revenue sharing agreement or code-sharing and/or revenue-sharing agreements in general? Or, something else related to how code-share tickets, costs, revenues are handled.

I'd say that the end objective is to provide the optimal frequency/capacity and fare for the route (from AC/LH perspective) so that passengers will rather choose AC or LH before anyone else on the competing routes. The revenue sharing aspect means that AC/LH don't compete with each other on the route in return for potentially better revenue for both. If this sounds anti-competitive that is because it is to an extent and why a number of revenue sharing ventures on transatlantic routes are getting considerable scrutiny from the various regulatory agencies.

Actual revenue sharing goes beyond basic code-sharing and typically involves a formal joint-venture agreement between the two airlines. A venture that is subject to regulatory considerations due to the above mentioned anti-competitive concerns.