@article {78,
	title = {Domain knowledge based queries for multimedia data retrieval},
	journal = {Journal of Digital Information Management},
	volume = {5},
	year = {2007},
	note = {Export Date: 10 July 2014},
	month = {2007},
	pages = {75 - 81},
	abstract = {This paper describes an approach for semantic description and retrieval of multimedia data described by means of MPEG-7. This standard uses XML schema to define the descriptions. Therefore, it lacks ability to represent the data semantics in a formal and concise way and it does not allow integration and use of domain specific knowledge. Moreover, inference mechanisms are not provided and hence the extraction of implicit information is not (always) possible. To address these issues, we propose to add a conceptual layer on top of MPEG-7 metadata layer, where the domain knowledge is represented using a formal language. A set of mapping rules is proposed. They serve as a bridge between the two layers. Querying MPEG-7 descriptions using XML query languages such as XPath or XQuery requires to know MPEG-7 syntax and documents structure. To provide a flexible query formulation, we exploit the conceptual layer vocabulary to express user queries. A user query, making reference to terms specified at the conceptual level, is rewritten into an XQuery expression over MPEG-7 descriptions.},
	keywords = {Logic languages, Mapping rules, MEPG-7, Multimedia data descriptions, Ontology, Semantic and structural aspects},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-44849105152\&partnerID=40\&md5=6bf0f55f03c657a4b5b8e32948cc69de},
	author = {Hammiche, S. and Lopez, B. and Benbernou, S. and Hacid, M.-S. and Vakali, A.}
}
