{% macro occurrence(item, link=false) -%}
{% if item %}
  {% if link %}<a href="#artifact-{{ item.id }}">{{ item.id }}</a>{% else %}{{ item.id }}{% endif %}
  <span class="muted">{{ item.kind }}/{{ item.representation }}, digest {{ item.digest }}</span>
{% else %}none{% endif %}
{%- endmacro %}