Path expression

Path expression

In query languages, path expressions identify an object by describing how to navigate to itin some (possibly implicit) Graph of objects. For example, the path expression "p".Manager.Home.City might refer the city of residence of someone's manager.Path expressions have been extended to support regular expression-like flexibility.
XPath is an example of a path expression language.

In concurrency control, path expressions are a mechanism for expressing permitted sequences of execution. For example, a path expression like " {read}, write" might specify that either multiple simultaneous executions of read or a single execution of write but not both are allowed at any point in time.

ee also

* Object database

References

*
*
*
*


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Path integral formulation — This article is about a formulation of quantum mechanics. For integrals along a path, also known as line or contour integrals, see line integral. The path integral formulation of quantum mechanics is a description of quantum theory which… …   Wikipedia

  • Path-ordering — In theoretical physics, path ordering is the procedure (or a meta operator {mathcal P}) of ordering a product of many operators according to the value of one chosen parameter::{mathcal P} left [O 1(sigma 1)O 2(sigma 2)dots O N(sigma N) ight] := O …   Wikipedia

  • Free-space path loss — In telecommunication, free space path loss (FSPL) is the loss in signal strength of an electromagnetic wave that would result from a line of sight path through free space, with no obstacles nearby to cause reflection or diffraction. It does not… …   Wikipedia

  • The Path to 9/11 — was a two part miniseries that aired in the United States on ABC television from September 10 ndash; 11, 2006, and also in other countries. The film dramatizes the 2001 terrorist attack upon the World Trade Center in New York City and the events… …   Wikipedia

  • Microsoft Expression Blend — 3 Screenshot …   Wikipedia

  • Fire Emblem: Path Of Radiance — Fire Emblem Path of Radiance Éditeur Nintendo Développeur …   Wikipédia en Français

  • Fire emblem: path of radiance — Fire Emblem Path of Radiance Éditeur Nintendo Développeur …   Wikipédia en Français

  • Fire Emblem: Path of Radiance — Fire Emblem Path of Radiance Éditeur Nintendo Développeur Intelligent Sy …   Wikipédia en Français

  • Available expression — In the field of compiler optimizations, available expressions is an analysis algorithm that determines for each point in the program the set of expressions that need not be recomputed. Those expressions are said to be available at such a point.… …   Wikipedia

  • The Aryan Path — was an Anglo Indian theosophical journal published in Bombay, India from 1930. Its purpose was to form a nucleus of universal brotherhood of humanity, without distinction of race, creed, sex, caste or color; to study ancient and modern religions …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”