An object-based merge tool for structured object models encapsulates data in files, such as metadata in XML files, as model objects in accordance with an underlying model, all of which can be graphically represented to a user. The model objects may be formed in any structure, such as a tree structure, which makes the semantical structure of the files understandable to the user. Graphical representation of files also allows the user to see how the files have been changed. The differences between files or file sets can be graphically represented to the user, such as through markings of the model objects in the tree structure, and the differences can be explained in an additional view. Related apparatus, computer program products and computer systems are also described.
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