Methods, systems, and articles of manufacture for viewing annotations created for data objects appearing in a data source using a second application configured to access and view the data source. Some embodiments present users viewing a data source with an indication of data objects in the data source that have been by other applications accessing the data source. An annotation system may use a mapping component to transform a set of parameters suitable for the first application to identify an annotated data object into a set of parameters suitable for the second application to view an annotated data object in a common data source.