{% assign image = nil %}
{% for data_image in site.data.images %}
  {% if data_image.source == include.image %}
    {% assign image = data_image %}
    {% break %}
  {% endif %}
{% endfor %}

{% if image %}
{% unless image.exclude %}
<image:image>
    <image:loc>{{ image.source | prepend: site.baseurl | prepend: site.url }}</image:loc>
    {% if image.caption %}<image:caption>{{ image.caption | xml_escape }}</image:caption>{% endif %}
    {% if image.title %}<image:title>{{ image.title | xml_escape }}</image:title>{% endif %}
    {% if image.license %}<image:license>{{ image.license }}</image:license>{% endif %}
</image:image>
{% endunless %}
{% else %}
<image:image>
    <image:loc>{{ include.image | prepend: site.baseurl | prepend: site.url }}</image:loc>
</image:image>
{% endif %}