The main goal of knowledge management is to improve the management of information and knowledge within and across enterprises. Enterprise knowledge is embedded in enterprise's data managed in a wide range of information systems (e.g., product data management and enterprise resource planning systems). These enterprise data can correspond to textual, numerical or multimedia. In the past, several search systems have been developed to provide access to primarily text-based enterprise content like web pages, data stored in database systems or emails. Similarly, dedicated search systems exist for searching information from multimedia data. As these search systems focus on particular enterprise content (e.g., textual data), they lack in providing a holistic view on available enterprise's knowledge.