Enterprises have gathered operational business information from multiple structured data sources and stored it in a central repository, called data warehousing, for decision support functionalities and data analysis. The enterprises are now realizing to integrate their entire information sources, including "unstructured" contents, for deeper and richer information analysis. Several applications, such as processing warranty claims, finding promotional materials in real-time based on user's transaction value, detecting health insurance claim processing frauds in (near) real-time by integrating information from various data sources (some of them may be from the competitors), etc., require integration of both structured and unstructured information based on events and business policies. Thus, it is vital for data warehousing to enable the integration of data and content sources to provide real-time read and write access, to transform data for business analysis and data interchange, and to data placement for performance, currency and availability.