Discovering digital documents can sometimes be challenging. A digital document has many attributes to find and has been updated in many versions. In digital government documents, it can become other digital documents in different repositories, so finding the source of digital documents from other digital documents is so uncommon. This paper describes how to find a digital document from other digital document sources from different repositories. Bringing together Xquery and graph theory encourages this research for flexibility and efficiency in developing a tool for the retrieval of documents. Furthermore, to achieve the goal of having many algorithms in this tool, the tool, called the resolver, will develop the knowledge bases for many algorithms that can be used in this tool. Hopefully, the resolver can be used by any algorithm occasionally.