Traditional URLs are simple and easy to use, but they’re also quite limited. For one thing, a URL only points at a single, complete document. More granularity than that, such as linking to the third sentence of the seventeenth paragraph in a document, requires the author of the targeted document to manually insert named anchors at the targeted location. The author of the document doing the linking can’t do this unless he or she also has write access to the document being linked to. Even if the author doing the linking can insert named anchors into
In 1986, a new ISO standard (ISO 8879) was released which aimed to make platform and display differences irrelevant to the delivery and rendering of documents. This standard detailed the language called the Standard Generalized Markup Language (SGML.)
Tim Berners-Lee and the Genesis of the WWW
In 1989, Tim Berners-Lee created a proposal for a hypertext document system to be used within the CERN community. Although based in Switzerland, CERN members were scattered throughout the globe and project turnover was often high. Collaboration over long
Identifiers: Uniform Resource Identifier (URI)
If I want to discuss something, I must first identify it. How else will you know what I'm referring to? I might do this in an indirect manner: "The North Star." "The strange man at the grocery store." "Those really sour candies that Bob always eats." I might also choose to be more direct: "Polaris." "Jonathan Roberts." "Mega Warheads."
To identify items on the Web, we also use identifiers. Because we use a uniform system of identifiers, and because each item identified is considered a "resource," we
This section describes the terms and concepts that are essential to understanding XLink, without discussing the syntax used to create XLink constructs. A few additional terms are introduced in later parts of this specification.
2.1 Links and Resources
[Definition: An XLink link is an explicit relationship between resources or portions of resources.] [Definition: It is made explicit by an XLink linking element, which is an XLink-conforming XML element that asserts the existence of a link.] There are six XLink elements; only two of them are considered