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web 2.0

web 2.0   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016

... 2.0 Informal a popular term used to distinguish interactive websites such as blogs , forums , and social media from earlier (pre-2000) uses of the World Wide Web , which tended to publish content with little or no participation from users. This earlier use is sometimes referred to retrospectively as web 1.0 . The term web 2.0 does not mark any technical evolution of the Web, but rather a trend in the usage of available web...

XSL

XSL  

Abbrev. for extensible stylesheet language. Two related languages for restructuring and formatting XML data. XSLT ( XSL Transformations) allow rules to be specified that restructure XML data, while ...
PostgreSQL

PostgreSQL  

A popular relational database management system. PostgeSQL began as the POSTGRES project at the University of California, Berkeley, in the 1980s, and the first version was released in 1989. The ...
frame

frame  

1 The total amount of information presented on a display at any one time.2 A part of a web page that acts as an independent unit within the page. In HTML, it is possible to define a number of frames ...
logarithm

logarithm  

The logarithm to base a(>0) of a positive number b is denoted by loga b=x, where ax=b. Logarithms have the fundamental property loga (bc)=loga b+loga c. A logarithm to base 10 is usually denoted by ...
web service

web service   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016

... service A software component that publishes its interface on and responds to requests from a network, in particular the Internet. web services use open XML-based standards: interfaces are published using WSDL (Web Services Description Language), and services usually communicate with their clients through SOAP messages. The ambition of web services is to use the Internet to implement large-scale distributed processing in an open way. http://www.w3.org/2002/ws/ The WC3’s Web Services Activity Page http://www.w3.org/TR/wsdl20-primer/ The WSDL (version ...

Document Object Model

Document Object Model   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016

...data is parsed into a tree of objects, which a programmer can navigate and manipulate. It is especially relevant to web browsers, and in particular to the implementation of dynamic HTML . The World Wide Web Consortium released the first version of the DOM (level 1) in 1998 , although a previous intermediate version (level 0) had already been incorporated in HTML 4; levels 2 and 3 have subsequently been released. Adoption of the DOM by web browsers—which had previously implemented idiosyncratic and incompatible models—was initially slow and is still not...

point

point   Quick reference

A Dictionary of the Internet (4 ed.)

Reference type:
Subject Reference
Current Version:
2019

...1 To place a browser cursor over a hyperlink to another Web site and then clicking. This results in the document referenced in the hyperlink being displayed by the browser. 2 A unit of measurement for displayed text, equal to approximately 0.35...

XSL

XSL   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016

...is far more widely used than XSL-FO. Its abilities exactly fulfilled a widespread need for a standard and convenient method of transforming XML data, whereas formatting on web browsers was already adequately addressed by the less sophisticated but widely established CSS . http://www.w3.org/TR/xslt-30/ The XSLT (version 3.0) specification http://www.w3.org/TR/xslfo20/ The XSL-FO (version 2.0)...

frame

frame   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016

...1. The total amount of information presented on a display at any one time. 2. A part of a web page that acts as an independent unit within the page. In HTML, it is possible to define a number of frames within the base page, and to read different documents into these frames. Early versions of browsers did not support the use of frames, but modern browsers do. 3. A single message or packet on a data link using a data link control protocol such as HDLC, ADCCP, etc. The frame is the unit of error detection, retransmission, etc. A special pattern of bits—a...

XML

XML   Quick reference

A Dictionary of Computer Science (7 ed.)

Reference type:
Subject Reference
Current Version:
2016

...the sequence ‘<tagname></tagname>’ may be abbreviated to ‘<tagname/>’. Elements may appear within other elements, but they must be properly nested; that is, an element’s own end tag must appear before those of any elements that enclose it: …web application <xr>framework</xr>.</def></en> is valid XML, but …web application <xr>framework.</def></xr></en> is not valid because the elements overlap. Also, at the top level, the whole of an XML document must consist of a single element (the root element ) that encloses all its content. An XML document that...

ampere

ampere   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...would produce between these conductors a force equal to 2 × 10 -7 newton per metre of length. (This number effectively set the magnetic permeability of vacuum at 4π × 10 -7 H⋅m -1 ; see permittivity .) The following are among the coherent derived units: • A⋅m -1 for magnetic field strength, magnetization; • A⋅m -2 for current density; • A⋅s = coulomb for quantity of electricity; • A⋅s⋅V -1 = farad for electric capacitance; • A⋅V -1 = siemens for electric conductance; • A⋅H = weber for magnetic flux; • A⋅turn for magnetomotive force. This...

SI system

SI system   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...= m 2 ⋅m -2 for solid angle: degree C = degree Celsius = K for temperature C = coulomb = s⋅A for electric charge, quantity of electricity N = newton = m⋅kg⋅s -2 for force Pa = pascal = N⋅m -2 for pressure, stress J = joule = N⋅m for energy, work, quantity of heat W = watt = J⋅s -1 for power, radiant flux V = volt = W⋅A -1 for voltage, e.m.f., potential difference F = farad = C⋅V -1 for electric capacitance Ω = ohm = V⋅A -1 for electric resistance S = siemens = Ω -1 for electric conductance Wb = weber = V⋅s for magnetic flux T = tesla = Wb⋅m -2 for...

volt

volt   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...current equals the ratio of power produced in watts to the current strength in amperes; equally the product of current strength in amperes and resistance in ohms. V = W⋅A -1 = A⋅Ω. SI , Metric-m.k.s.A. (= m 2 ⋅kg⋅s -3 ⋅A -1 in base terms). The following are among the coherent derived units: • V⋅m -1 for electric field strength; • V⋅s = weber for magnetic flux; • V⋅A for apparent power; • V⋅A -1 = ohm for electric resistance. Metric-c.g.s. See abvolt (a base unit for the e.m.u. system); statvolt. See also practical unit . UK 1 MV = 1...

SI alphabet

SI alphabet   Quick reference

A Dictionary of Weights, Measures, and Units

Reference type:
Subject Reference
Current Version:
2004

...else composite) measure-unit symbol in the string. The preferred practice now is to restrict such uses of powers to exponents that are multiples of 3, i.e. to integer powers of 1 000. Thus a value that might be written as 1.732 × 10 11 should be written as 173.2 × 10 9 else 0.173 2 × 10 12 . For mass, such multipliers should apply to the kilogram; for most other circumstances they should preferably apply directly to an unqualified unit else to a string of them. Unless there is special cause, a compound expression should be resolved into standard...

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