A storage and retrieval method of XML-based metadata in PVR environment

This paper presents a design of a metadata engine that supports storage and retrieval of XML-based metadata in PVR environment. As the XML-based metadata possibly consist of various parts and are described in a large hierarchical XML document, a series of preprocessing steps such as fragmentation, binary encoding, encapsulation, and indexing is performed before they are to be transferred from the sender to the receiver via broadcast networks. The proposed metadata engine is designed so that the cost of accessing the XML-based metadata can be minimized and, at the same time, dynamic updating and versioning fir the metadada can be accomplished with moderate cost.(1)