13_simple.xml

<?xml version="1.0" encoding="UTF-8"?>
<book>
    <title>Introduction to XML</title>
    <author>John Doe</author>
    <publicationYear>2022</publicationYear>
</book>

<!-- The root element is <book>.
It contains child elements <title>, <author>, and <publicationYear>.
Each child element has text content providing information about the book.
This is a basic structure, and XML can be used to represent more complex data with nested elements and attributes. Remember that XML documents start with a declaration (<?xml version="1.0" encoding="UTF-8"?>). The declaration specifies the XML version and the character encoding used in the document. 
-->