XML Syntax

The following is a succinct guide for the syntax rules of the eXtensible Markup Language (XML):

All XML elements must have a closing tag
```
<p>This is a paragraph</p>
```
Comments in XML
```

```

XML tags are case sensitive

<TITLE>This example is incorrect</title>  <!-- INCORRECT -->

<title>This example is correct</title>

XML elements must be properly nested

<strong><em>This text is important and emphasized</strong></em>
    <!-- INCORRECT because closing em tag appears out of order -->

<strong><em>This text is important and emphasized</em></strong>

XML documents must have a root element

XML documents must contain one element that is the parent of all other elements. This element is called the root element.
```
<html>
  <head>
    <title>Title</title>
  </head>
</html>
```

XML attribute values must be quoted

<img src=image.png />
    <!-- INCORRECT because `image.png` is not quoted -->

<img src="image.png" />

Special characters in XML

<code>if salary < 1000:</code>
    <!-- INCORRECT because `<` confused with start of tag -->

<code>if salary &lt; 1000:</code>

Entity	Symbol	Description
<	<	less than
>	>	greater than
&	&	ampersand
'	’	apostrophe
"	”	quotation mark