how to use section tag in bootstrap

1<section id="header"> Name of section
2	<div class="container">
3		<div class="row">
4			<div class="col-xs-12"></div>
5		</div>
6	</div> 
7</section>
8
9<section id="main-content"> Name of section
10	<div class="container">
11		<div class="row">
12			<div class="col-xs-6"></div>
13			<div class="col-xs-6"></div>
14		</div>
15	</div> 
16</section>
17
18<section id="footer"> Name of section
19	<div class="container-fluid">
20		<div class="row">
21			<div class="col-xs-4"></div>
22			<div class="col-xs-4"></div>
23			<div class="col-xs-4"></div>
24		</div>
25	</div> 
26</section>