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Structured Scalable Meta-formats (SSM) Version 2.0 for Content Agnostic Digital Item Adaptation - Principles and Complete Syntax
Mukherjee, Debargha; Kuo, Geraldine; Said, Amir
Keyword(s): scalable bit-stream; format-agnostic; content- agnostic; adaptation engine
Abstract: This paper develops an end-to-end methodology for representation and adaptation of arbitrary scalable content in a fully content non-specific manner. Scalable bit-streams are naturally organized in a symmetric multi-dimensional logical structure, and any adaptation is essentially a downward manipulation of the structure. Higher logical constructs are defined on top of this multi-tier structure to make the model more generally applicable to a variety of bit-streams involving rich media. The resultant composite model is referred to as the Structured Scalable Meta-format (SSM). Apart from the implicit bit-stream constraints that must be satisfied to make a scalable bit-stream SSM-compliant, two other elements that need to be standardized to build a complete adaptation and delivery infrastructure based on SSM are:( 1) a binary or XML description of the structure of the bit-stream resource and how it is to be manipulated to obtain various adapted versions; and (2) a XML specification of outbound constraints derived from capabilities and preferences of receiving terminals. By interpreting the descriptor and the constraints a universal adaptation engine can adapt the content appropriately to suit the specified needs and preferences of recipients, without knowledge of the specifics of the content, its encoding and/or encryption. With universal adaptation engines, different adaptation infrastructures are no longer needed for different types of scalable media.
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