XML documents are “well formed”

• Every element has a start-tag and an end-tag
  • For example:

<para>This is a test. This is only a test.</para>

• There is a special empty-element form that includes the slash before the closing angle bracket:

<zip code="94710" adc="945" />

• A document has one root element
• Markup characters used in text must be represented as entities
  • &quot; for "
  • &lt; for <
  • &gt; for >