If no URI is specified, the locator is assumed to be within the document that contains the linking element. An identifier used to name the element so that it can be referred to, or referenced from, somewhere else. Each ID within a document must have a unique value. The ID attribute regularizes the naming of the element and thus facilitates building links between it and other resources. Specification defining whether or not the element containing the link serves as one of the resources for the link.
Most simple links are inline.
ROLE Information that explains to application software the part that a remote resource plays in a link. A control that defines whether a remote resource that is the target of a link appears at the point of the link, replaces the existing link, or appears in a new window. The type of XML link being employed. The locator for a remote resource in a simple or locator link. Home Page Copyright Society of American Archivists, 1998.