Extending the XML-RPC API to be able to get all versions of an attachment

We are developing a prototype which is able to preserve the content generated within a wiki. At the moment, we are implementing functionality to preserve wikis using XWiki as the underlying wiki software.

In our data model we have media entities, which act as a container for all versions of this media entity. That means, we need access to all versions of an attachment in XWiki via XML-RPC interface. Otherwise some attachments will not be included in our archive if more than one revision of an attachment is added since the last time the wiki was preserved. We would only be able to preserve the most recent attachment.

Further, i did not find a way to retrieve the version number of a given attachment. Would be great also, if a method were added which returns the actual version number of a given attachment.