In the tutorial listed below, Why is $Students and $Mentors accessible in ProjectsHolder.ss?
https://docs.silverstripe.org/en/3.1/tutorials/dataobject_relationship_management/
<% include SideBar %>
<div class="content-container unit size3of4 lastUnit">
<article>
<h1>$Title</h1>
<div class="content">
$Content
<table>
<thead>
<tr>
<th>Project</th>
<th>Students</th>
<th>Mentors</th>
</tr>
</thead>
<tbody>
<% loop $Children %>
<tr>
<td>
<a href="$Link">$Title</a>
</td>
<td>
<% loop $Students %>
$Name ($University)<% if $Last !=1 %>,<% end_if %>
<% end_loop %>
</td>
<td>
<% loop $Mentors %>
$Name<% if $Last !=1 %>,<% end_if %>
<% end_loop %>
</td>
</tr>
<% end_loop %>
</tbody>
</table>
</div>
</article>
</div>
