Documents represent an interesting source for decisional analyses. They help decision makers to better understand the evolution of their business activities. Therefore, they merit to be warehoused for decision purposes within organizations. Generally, these documents exist in XML format and are described by multiple structures. In this paper, we present a semi-automatic approach to build the XML Document Warehouse. This approach is made up of two methods namely: Unification of structures of XML Structures, and Multidimensional modeling. More specifically, this paper focuses on the experiment and evaluation of the proposed approach for warehousing document-centric XML documents.