Building the Data Warehouse,3rd Edition
Building the Data Warehouse,3rd Edition
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Due to the evolution of e-learning, a large amount of educational material is produced. Learning objects (OPs) are created by various universities and used primarily within the institution that created them. LOM description that can be associated with each OO is the first description essential to facilitate access, sharing and reuse. However it does not frame the choices made enough in the description of the contents of OP. At the semantic web, it is then necessary to associate semantic annotations to the content of OP to help locate them. We propose in this research a model of distributed storage "crown tine" which is based on the description of OPs by LOM metadata and concepts of domain ontologies. These two complementary descriptions allow the query semantics of OP. Thus, each university has its own warehouse, containing the OP, LOM and their semantic annotations. Metadata and annotations for each local warehouse is duplicated in a central warehouse and meta shared, accessible from a common server. Access to OPs available in other local warehouses is done via the metadata warehouse.