Phd
Web Address: http://www.diigo.com/list/thanigai/phdYou are here: Diigo Home > Thanigaivel G > Thanigaivel G's lists
-
31Expand
MPEG-21
Tags: mpeg on 2008-04-15 and saved by2 people -All Annotations (0) -About
more fromwww.chiariglione.org
-
-
-
MPEG-21 Part 3 - Digital Item Identification
-
The need for technological solutions to
these challenges is motivating the MPEG-21 Multimedia Framework initiative that
aims to enable the transparent and augmented use of multimedia resources across
a wide range of networks and devices.. -
MPEG-21 is based on two essential concepts:
the definition of a fundamental unit of distribution and transaction (the
Digital Item) and the concept of Users interacting with Digital Items. The
Digital Items can be considered the “what” of the Multimedia Framework (e.g., a
video collection, a music album) and the Users can be considered the “who” of
the Multimedia Framework. -
A User is any entity that interacts in the MPEG-21 environment or makes use of a
Digital Item. Such Users include individuals, consumers, communities,
organisations, corporations, consortia, governments and other standards bodies
and initiatives around the world -
interactions are creating content, providing content, archiving content, rating
content, enhancing and delivering content, aggregating content, delivering
content, syndicating content, retail selling of content, consuming content,
subscribing to content, regulating content, facilitating transactions that occur
from any of the above, and regulating transactions that occur from any of the
above -
Digital Item Declaration specification (part 2 of ISO/IEC 21000) provides such
flexibility for representing Digital Items -
A Digital Item Declaration (DID) is a document that specifies the makeup,
structure and organisation of a Digital Item. Part 2 of MPEG-21 contains the DID
Specification -
MPEG-21 has established a work plan for future standardisation.
Nine parts of standardisation within the Multimedia Framework have already
started -
- Define a 'vision' for a multimedia
framework to enable transparent and augmented use of multimedia resources across
a wide range of networks and devices to meet the needs of all users - Achieve the integration of components and
standards to facilitate harmonisation of 'technologies' for the creation,
management, transport, manipulation, distribution, and consumption of digital
items. - Define a 'strategy' for achieving a
multimedia framework by the development of specifications and standards based on
well-defined functional requirements through collaboration with other
bodies.
- Define a 'vision' for a multimedia
-
Model: The Digital Item Declaration Model describes a set of
abstract terms and concepts to form a useful model for defining Digital Items.
Within this model, a Digital Item is the digital representation of “a work”, and
as such, it is the thing that is acted upon (managed, described, exchanged,
collected, etc.) within the model.Representation: Normative description of the syntax and
semantics of each of the Digital Item Declaration elements, as represented in
XML. This section also contains some non-normative examples for illustrative
purposes.Schema: Normative XML schema comprising the entire grammar of
the Digital Item Declaration representation in XML.
The DID technology is described in three
normative sections: -
-
A container is a structure that allows items
and/or containers to be grouped -
-
An item is a grouping of sub-items and/or components that
are bound to relevant descriptors -
The relationship between items and
Digital Items (as defined in ISO/IEC 21000-1:2001, MPEG-21 Vision,
Technologies and Strategy) could be stated as follows: items are
declarative representations of Digital Items. -
-
component is the binding of a resource to all of its relevant
descriptors -
5.2.4
AnchorAn anchor binds descriptors to
a fragment, which corresponds to a specific location or range within a
resource. -
5.2.5
DescriptorA descriptor associates information with the enclosing
element. This information may be a component (such as a thumbnail of an
image, or a text component), or a textual statement. -
5.2.6
ConditionA condition describes the enclosing element as being
optional, and links it to the selection(s) that affect its inclusion -
5.2.7
ChoiceA choice describes a set of related
selections that can affect the configuration of an item -
5.2.8
SelectionA selection describes a specific
decision that will affect one or more conditions somewhere within an
item -
5.2.9
AnnotationAn annotation describes a set of information about
another identified element of the model without altering or adding to that
element. -
5.2.10 Assertion
An assertion defines a full or
partially configured state of a choice by asserting true, false or
undecided values for some number of predicates associated with the
selections for that choice. -
.2.11 Resource
A resource is an individually
identifiable asset such as a video or audio clip, an image, or a textual
asset -
-
-
5.2.14 Predicate
A predicate is an unambiguously
identifiable Declaration that can be true, false or undecided -

-

