Systems and methods for processing documents are disclosed. Documents received at a data server are transcoded using locally stored or generated code books. Code books for transcoded documents received at a wireless mobile communication device are either retrieved from a memory on the device or requested from a data server. In response to a code book request, a data server retrieves a requested code book from a local memory or generates the requested code book and returns the requested code book to a requestor. A wireless mobile communication device may also generate and transcode XML documents using a locally stored code book, a locally generated code book, or a code book received in response to a code book request.