In this article we consider the issue of ranking XML data and data sources in a distributed XML data warehouse. Our ranking model applies to service-oriented data management applications where web services store and exchange XML fragments. Each service publishes a set of operations implemented as parameterized queries on a local XML data warehouse integrating locally generated data and query results received from other services. We propose a new way for ranking distributed data and data sources taking into consideration their usage for the evaluation of queries. The main results are a formal ranking model of data, queries and services and an implementation on a data warehouse.