Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
Let’s look again at the XML document shown earlier (Listing 4.1).
Our document is composed of a set of tagged constructs, with each tag bounded by angle brackets (< and >). The first construct is called the XML declaration. This line identifies the XML version, specifies an encoding (a subject far afield from most business development), and includes an initial and final question mark (?).