Motivated by our work on object-oriented Content Management, this paper proposes an extensible formal framework for delta and merging strategies, each applicable to a specific type of content under specific constraints. By exploiting type-specific constraints, adequate deltas can be computed even without detailed operation logs. The framework thereby allows the use of unmodified third-party editing applications. We present initial experience with conflict detection and content merging algorithms for a number of link collection types, namely sets, lists, maps, and maps without duplicates.