feat: Provide xml2rfc compatible BibXML for BibXML download button (i…

…etf-tools#447)

Fixes ietf-tools#445

main/templates/citation/export.html

@@ -22,6 +22,23 @@
  </span>
  {% endfor %}
  {% for format in available_serialization_formats %}
+ {% if format == "bibxml" and xml2rfc_urls %}
+ {% for _, url, _ in xml2rfc_urls|slice:":1" %}
+ <a
+ class="link button-v2 shrink-0 grow-0"
+ href="{{ url }}"
+ >
+ <span class="label">
+ {{ format }}
+ </span>
+ <span class="icon">
+ <svg xmlns="http://www.w3.org/2000/svg" class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor">
+ <path fill-rule="evenodd" d="M3 17a1 1 0 011-1h12a1 1 0 110 2H4a1 1 0 01-1-1zm3.293-7.707a1 1 0 011.414 0L9 10.586V3a1 1 0 112 0v7.586l1.293-1.293a1 1 0 111.414 1.414l-3 3a1 1 0 01-1.414 0l-3-3a1 1 0 010-1.414z" clip-rule="evenodd" />
+ </svg>
+ </span>
+ </a>
+ {% endfor %}
+ {% else %}
  <a
  class="link button-v2 shrink-0 grow-0"
  href="{% url "export_citation" %}?doctype={{ docid.type }}&docid={{ docid.id|urlencode:"" }}&format={{ format }}"
@@ -35,6 +52,7 @@
  </svg>
  </span>
  </a>
+ {% endif %}
  {% endfor %}
 {% else %}
  <a