Tracking changes in complex object graph

Question

I started to think about tracking changes in complex object graph in disconnected application. I have already found several solutions but I would like to know if there is an

Answer 1

our architecture is very similar to yours, but using a Silverlight client containing the same domain objects (that no exact - the code is shared) on client and server. The key points of our architecture is in short

• The client has the domain model and the changes are tracked using my own implemented tracking framework (it uses AOP so that I can use POCOs on the client side; I do not know a framework for that and I want the domain model to be persistent ignorant)
• This whole model is stored in a kind of remote repository on the client. When we save those changes, a changes tree will be extracted (by my change tracking framework) and translated in DTOs (exactly DataContracts but that doesn't matter) using assemblers. The DTOs have a tracking state flag (new, modified, deleted).
• On the server side (the service layer is implemented by WCF webservices) the DTOs are translated to domain objects and attached to the ORM (NHibernate in our case). Because of this attachmentent process I need the tracking state. Than additional changes can be done and persisted via ORM

Currently it is difficult to attach complex graphs to the ORM but I'll hope the reason is that I we do not have much experience in using NHibernate.

We're not finished yet but it seems to be promising.

For data access we tried to use WCF Dataservices. But I don't think that we are going to use them because a requirement is using DataContract. That leads to a translation from DataContract based LINQ queries to domain object based LINQ queries. That is not handy and too difficult to implement if domain model and datacontracts differ very much (that will be the case in some iterations).

Any considerations?