{% for subject in subjects %}
    <li>{% if subject.children.count > 0 %}<span class="caret"></span><strong>{% endif %}<input type="checkbox" name="subject" value={{ subject.pk }}{% if subject in preprint.subject.all %} checked{% endif %}> {% if subject.children.count > 0 %}</strong> {% endif %}{{ subject }}
    {% if subject.children.count > 0 %}
        <ul class="nested tree">
            {% include "admin/elements/repository/tree.html" with subjects=subject.children.all %}
        </ul>
    {% endif %}
    </li>
{% endfor %}