Elements are the main structure of an XML document. An element is defined as a group of one or more subelements or subgroups, character data, EMPTY, or ANY. Element type declarations identify the names of elements, the nature of their content, and how to use them. They have the following generic syntax:
<!ELEMENT elementName elementContents >
Sometimes the content is text. At other times, the content consists of other elements that are arranged in a certain order or used a certain number of times. The list of contents in an element type declaration is called the content model.
The element rules build a hierarchy of elements that describe how one element relates to another element. XML ...