Creating Extended Links

Sets of Locators Extended links use containment to identify sets of locators (and occasionally local resources). The set is defined by a parent element, which contains the properties for the set, while elements within that parent may be locators or resources.
Set Properties The set itself has a role and a title. This information can be used to build link directories outside of the context of particular documents and to define the type of link within the document.
Locator Properties Locators contain the all-important href attribute, as well as role, title, and IDs. The href attribute is really the identifying feature of a locator, providing a URL pointer to resources.
Arcs Extended links may also contain arcs, which identify connections between particular locators. They provide detailed information on traversal paths, including show and actuate information.