Open Source Document Management System | OpenKM

I have an Web 2.0 application with Chat, Mashup, Blog/Forum and Tagging facilities. I need to incorporate Document Management, Workflow etc into that application. So thought of using OpenKM.

I would like to have clarification on below...

I do not want to use OpenKM as it is. But incorporate/integrate its features into my Web 2.0 app. Is it possible to do such customization?
Please point me to the documentation relevant to this.

Yes but it'll need some job.

First !!! You can not directly integrate navigator, tree or any UI part in your application. ( I want to remember that OpenKM comes with a workflow if you want to use it ). You can not do it, basically because use is an integrated application, not parts, it's not the typical php, jsp script web page, that's the first you must understand, it's made with GWT ( you create an application like swing an is converted to js automatically, that's the idea and the reason why you could not take some parts directly and incorporate in your app structure ).

But, all OPenKM has exposed API by webservices, really all operation can be made with remote call, that's the way to integrate some parts or all in other applications.

First we must understand which UI would you like to incorporate and then I could suggest to you which could be the best solution. If you could make some mashup it'll be right.