Bookmark (World Wide Web)

In the context of the World Wide Web, a bookmark is a Uniform Resource Identifier (URI) that is stored for later retrieval in any of various storage formats. All modern web browsers include bookmark features. Bookmarks are called favorites or Internet shortcuts in Internet Explorer, and by virtue of that browser's large market share, these terms have been synonymous with bookmark since the first browser war. Bookmarks are normally accessed through a menu in the user's web browser, and folders are commonly used for organization. In addition to bookmarking methods within most browsers, many external applications offer bookmark management.

Bookmarks have been incorporated in browsers since the Mosaic browser in 1993. Bookmark lists were called Hotlists in Mosaic and in previous versions of Opera; this term has faded from common use. Other early web browsers such as ViolaWWW and Cello also had bookmarking features.

With the advent of social bookmarking, shared bookmarks have become a means for users sharing similar interests to pool web resources, or to store their bookmarks in such a way that they are not tied to one specific computer or browser. Web-based bookmarking services let users save bookmarks on a remote web server, accessible from anywhere.

.web

.web is a generic top-level domain that will be awarded by ICANN to one of seven registry applicants. The .web TLD will be in the official root once ICANN awards the registry contract.

Historic information about .web

.web was operated as a prospective registry, not in the official root, by Image Online Design since 1995. It originated when Jon Postel, then running the top level of the Domain Name System basically single-handedly, proposed the addition of new top-level domains to be run by different registries. Since Internet tradition at the time emphasized "rough consensus and running code", Christopher Ambler, who ran Image Online Design, saw this as meaning that his company could get a new TLD into the root by starting up a functional registry for it. After asking and receiving permission from IANA to do so, IOD launched .web, a new unrestricted top level domain.

Since then IOD has tried to get their domain into the official root through several plans to admit new top-level domains. Several new-TLD plans in the late 1990s, including Postel's original proposal, failed to reach sufficient consensus among the increasingly contentious factions of the Internet to admit any new TLDs, including .web. When ICANN accepted applications for new TLDs in 2000 which resulted in the seven new domains added soon afterward, IOD's application was not approved; neither was it officially rejected, however, since all unapproved applications remain in play for possible future acceptance. A second round of new TLDs, however, was done entirely with new applications, and only for sponsored domains (generally intended for use by limited communities and run by nonprofit entities). The .web registry remains hopeful, however, that their application will eventually be approved. On May 10, 2007, ICANN announced the opening of public comments towards a new, third round of new gTLDs, a round in which IOD has not participated.

Web

Web or Webs may refer to:

Arachnology

Computing

Mathematics

Web (differential geometry)

In mathematics, a web permits an intrinsic characterization in terms of Riemannian geometry of the additive separation of variables in the Hamilton–Jacobi equation.

Formal definition

An orthogonal web on a Riemannian manifold (M,g) is a set of n pairwise transversal and orthogonal foliations of connected submanifolds of codimension 1 and where n denotes the dimension of M.

Note that two submanifolds of codimension 1 are orthogonal if their normal vectors are orthogonal and in a nondefinite metric orthogonality does not imply transversality.

Alternative definition

Given a smooth manifold of dimension n, an orthogonal web (also called orthogonal grid or Ricci’s grid) on a Riemannian manifold (M,g) is a set of n pairwise transversal and orthogonal foliations of connected submanifolds of dimension 1.

Remark

Since vector fields can be visualized as stream-lines of a stationary flow or as Faraday’s lines of force, a non-vanishing vector field in space generates a space-filling system of lines through each point, known to mathematicians as a congruence (i.e., a local foliation). Ricci’s vision filled Riemann’s n-dimensional manifold with n congruences orthogonal to each other, i.e., a local orthogonal grid.