Document evolution is usually performed by creating a new document which explicitly details changes to specific paragraphs inside other documents content. Obtaining (virtual) document versions corresponding to its tsate at a specific date is left to the document users, who manually extract fromlibrary collections, and compose, the pieces of text to obtain teh desired version. But this can be a very tedious and difficult task when changes are numerous. We propose a solution to dynamically generate virtual document versions on user demand, respecting the library documents integrity.REFernecs to other documents and modification relationships can be automatically detected and are modelled as typed links ( XLink) in a relationship graph. In this paper, we focus on the version generation process,consisting in a dynamic document composition based on a graph exploration. This solution has already shown its adequacy with a legislative digital library.