Perch 2.8 Blocks template example

mixed_article.html

<perch:blocks>
	<perch:before>
	<div class="row">
	    <div class="col-md-6 col-md-offset-3">
	</perch:before>

		<perch:block type="text" label="Text">
			<perch:content id="text" type="textarea" markdown="true" editor="markitup" size="s" label="Text" />
		</perch:block>

		<perch:block type="pullquote" label="Pull quote">
			<blockquote>
			      <perch:content id="quote" type="textarea" markdown="true" size="xs" label="Quote" />
			      <cite>&mdash; <perch:content id="cite" type="smarttext" label="By" /></cite>
			</blockquote>
		</perch:block>

		<perch:block type="image" label="Big image">
			<figure class="full">
			  <img src="<perch:content id="image" type="image" width="1600" label="Image" />" class="img-responsive" />
			  <figcaption><perch:content id="caption" type="smarttext" label="Caption" /></figcaption>
			</figure>
		</perch:block>

		<perch:block type="inlineimage" label="Inline image">
			<figure class="inline <perch:content id="class" type="select" options="Pull left|pull-left,Pull right|pull-right" label="Alignment" order="2" />">
			    <img src="<perch:content id="image" type="image" width="360" density="2" label="Image" order="1" />" class="img-responsive" />
			</figure>
		</perch:block>

	<perch:after>
		</div>
	</div>
	</perch:after>
</perch:blocks>

Hi, it's possible to add perch:before and perch:after in perch:block ?