What Is XML Explain Structure of XML Data Document?

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Larry Thompson

XML, which stands for eXtensible Markup Language, is a popular markup language used for storing and transporting data. It is often used as a standard format for exchanging information between different systems and platforms. In this article, we will explore the structure of an XML data document.

What Is XML?
XML is a markup language that uses tags to define elements and attributes to provide additional information about those elements. It was designed to be both human-readable and machine-readable, making it easy to understand by humans and process by computers.

Structure of XML Data Document
An XML document has a hierarchical structure consisting of elements, attributes, and content. Let’s take a closer look at each of these components:

Elements:
Elements are the building blocks of an XML document. They represent the different parts or components of the data being stored. Each element is enclosed within opening and closing tags () and can contain other elements or text content.

Syntax:

<element>content</element>

The opening tag starts with a less-than symbol (<), followed by the element name, and ends with a greater-than symbol (>). The closing tag has the same format but includes a forward slash (/) before the element name.

For example, consider an XML document representing information about books:

<books>
  <book>
    <title>Harry Potter</title>
    <author>J.K. Rowling</author>
    <year>2005</year>
  </book>
  <book>
    <title>The Great Gatsby</title>
    <author>F. Scott Fitzgerald</author>
    <year>1925</year>
  </book>
</books>

In this example, the <books> element is the root element, and it contains two <book> elements as its children. Each <book> element contains child elements such as <title>, <author>, and <year>.

Attributes:
Attributes provide additional information about an element. They are defined within the opening tag of an element and consist of a name-value pair. Attributes are used to describe characteristics or properties of an element.

Syntax:

<element attribute=”value”></element>

For example, let’s consider an XML document representing information about students:

<students>
<student id="1">
<name>John Smith</name>
<age>20</age>
</student>
<student id="2">
<name>Jane Doe</name>
<age>22</age>
</student&g