ABSTRACT
XML-based metadata is widely adopted across the different communities
and plenty of commercial and open source tools for processing and
transforming are available on the market. However, all of these tools
have one thing in common: they operate on plain text encoded metadata
which may become a burden in constrained and streaming environments,
i.e., when metadata needs to be processed together with multimedia
content on the fly. In this paper we present an efficient approach for
transforming such kind of metadata which are encoded using MPEG's
Binary Format for Metadata (BiM) without additional en-/decoding
overheads, i.e., within the binary domain. Therefore, we have developed
an event-based push parser for BiM encoded metadata which transforms
the metadata by a limited set of processing instructions – based on
traditional XML transformation techniques – operating on bit patterns
instead of cost-intensive string comparisons.

Keywords: universal multimedia access, multimedia adaptation,
compressed-domain metadata processing, bitstream adaptation in
constrained and streaming environments, MPEG-21, Digital Item Adaptation,
generic Bitstream Syntax Description