CGI - (the Common Gateway Interface) is a standard way
for a Web server to pass a Web user's request to an application
program and to receive data back to forward to the user. The common
gateway interface provides a consistent way for data to be passed
from the user's request to the application program and back to
the user. This means that the person who writes the application
program can makes sure it gets used no matter which operating
system the server uses (PC, Macintosh, UNIX, OS/390, or others).
It's simply a basic way for information to be passed from the
Web server about your request to the application program and back
MPEG standards - The MPEG standards are an evolving set
of standards for video and audio compression and for multimedia
delivery developed by the Moving Picture Experts Group (MPEG).
MPEG-1 was designed for coding progressive video at a transmission
rate of about 1.5 million bits per second. It was designed specifically
for Video-CD and CD-i media. MPEG-1 audio layer-3 (MP3) has also
evolved from early MPEG work.
MPEG-2 was designed for coding interlaced images at transmission
rates above 4 million bits per second. MPEG-2 is used for digital
TV broadcast and DVD. An MPEG-2 player can handle MPEG-1 data
MPEG-1 and -2 define techniques for compressing digital video
by factors varying from 25:1 to 50:1. The compression is achieved
using five different compression techniques.
MPEG-3 A proposed MPEG-3 standard, intended for High Definition
TV (HDTV), was merged with the MPEG-2 standard when it became
apparent that the MPEG-2 standard met the HDTV requirements.
MPEG-4 is a much more ambitious standard and addresses
speech and video synthesis, fractal geometry, computer visualization,
and an artificial intelligence (AI) approach to reconstructing
images. MPEG-4 addresses a standard way for authors to create
and define the media objects in a multimedia presentation, how
these can be synchronized and related to each other in transmission,
and how users are to be able to interact with the media objects.
MPEG-21 provides a larger, architectural framework for
the creation and delivery of multimedia.
SMIL - (Synchronized Multimedia Integration Language),
is a language that allows Web site creators to be able to easily
define and synchronize multimedia elements (video, sound, still
images) for Web presentation and interaction. On today's Web,
although you can send moving and still images and sound to a Web
user, each element is separate from the others and can't be coordinated
with other elements without elaborate programming. SMIL (pronounced
"smile") lets site creators send multiple movies, still
images, and sound separately but coordinate their timing. Each
media object is accessed with a unique Uniform Resource Locator
(URL) which means that presentations can be made of objects arriving
from more than one place and that objects can easily be reused
in multiple presentations.
SMIL also lets the "producer" store a media object in
multiple versions, each with a different bandwidth so that a lower-bandwidth
version of a Web page can be sent to users who need it. SMIL also
accommodates multiple language versions of soundtracks.
VDSL - (Very-high speed Digital Subscriber Line) will
eventually emerge as a primary "last-mile" broadband
solution for both the home and business. The value proposition
for VDSL in both marketplaces is very attractive. VDSL enables
Telcos to offer broadband services that provide a quantum leap
in terms of access speed and applications available to the end
user. VDSL provides Telcos the technology to compete in the residential
market for bundled voice, data and video services using copper
infrastructure without having to install fiber-to-the-home. Likewise,
VDSL will provide a very low cost data transfer technology enabling
high-speed data networking, high quality video conferencing and
multiple voice lines for businesses over the existing copper infrastructure.
Although the capabilities of VDSL are revolutionary, the industry
has to overcome distance limitations and standards issues before
the technology will be viable as a mass-market solution.
VDSL is one of the most promising technologies to emerge in the
current telecommunications market. Like other xDSL technologies
(ADSL, SDSL and G.lite), VDSL utilizes a single twisted copper
pair to provide high speed access. While other xDSL services are
capable of up to 8 Mbps download speed, VDSL facilitates transfer
rates of up to 52 Mbps, which is 1,000 times the capacity of today's
dial-up lines. VDSL soon will be cost competitive with other xDSL
SVG - (Scalable Vector Graphics) is the description of
an image as an application of the Extensible Markup Language (XML).
Any program such as a Web browser that recognizes XML can display
the image using the information provided in the SVG format. vector
graphics is the expression of an image using mathematical statements
rather than bit-pattern description. Scalable emphasizes that
vector graphic images can easily be made scalable (whereas an
image specified in raster graphics is a fixed-size bitmap). Thus,
the SVG format enables the viewing of an image on a computer display
of any size and resolution, whether a tiny LCD screen in a cell
phone or a large CRT display in a workstation. In addition to
ease of size reduction and enlargement, SVG allows text within
images to be recognized as such, so that the text can be located
by a search engine and easily translated into other languages.
Vector graphics images also have the potential advantage over
the standard Web image formats, the GIF and the JPEG, of size.
Compared with a bitmap image, an SVG image may be much smaller
and arrive more quickly.
WSDL - (the Web Services Description Language) is an XML-based
language used to describe the services a business offers and to
provide a way for individuals and other businesses to access those
services electronically. WSDL is the cornerstone of the Universal
Description, Discovery, and Integration (UDDI) initiative spearheaded
by Microsoft, IBM, and Ariba. UDDI is an XML-based registry for
businesses worldwide, which enables businesses to list themselves
and their services on the Internet. WSDL is the language used
to do this.
WSDL is derived from Microsoft's Simple Object Access Protocol
(SOAP) and IBM's Network Accessible Service Specification Language
(NASSL). WSDL replaces both NASSL and SOAP as the means of expressing
business services in the UDDI registry.