Secure XML: The New Syntax for Signatures and Encryption

7.1. URIs

A Uniform Resource Identifier [RFC 2396] is the fundamental way to name or locate something in the World Wide Web. Formally, URIs represent the union of Uniform Resource Locators and Uniform Resource Names [RFC 2141].

7.1.1. URI Syntax

The most general syntax for a URI is

							Scheme ":" scheme-specific-part
						

If the scheme-specific-part starts with a double slash (“//”), the URI is called a “generic URI.” In this case, a specific substructure to the scheme-specific-part is implied as follows:

							Scheme "://" authority
							path [ "?" query ]

Here square brackets surround the optional parts, italics indicate variables, and quoted text indicates fixed characters.

The scheme name is case independent and must start with a letter. The remainder of ...