Temporal XML Data Warehouses: Challenges and Solutions
Kjetil Nørvåg · 2002
Increasing amounts of data is stored in XML. In order to facilitate more efficient querying on this data, and in particular on data from several sources (for example Web sites), data can be loaded into an XML data warehouse. Often, we want to query historical document versions, or query changes between document versions. This can be facilitated by a temporal XML data warehouse (XML-DW). In this paper, we study some of the challenges we meet in an XMLDW, in particular those related to consistency, and propose how these challenges can be met. We also identify some problems that are difficult to solve automatically in a temporal XML-DW. Many of the issues described in this paper are also applicable in a broader context, for example for general Web warehouses storing on HTML web pages.