... When embedded within a base document, a URL in its absolute form may contain a great deal of information which is already known from the context of that base document's retrieval, including the scheme, network location, and parts of the url-path. ... Introduction This document describes the syntax and semantics for "relative" Uniform Resource Locators (relative URLs): a compact representation of the location of a resource relative to an absolute base URL. ... 3.1) Base URL embedded in the | ...