FeedMe - Extracting attribute from an RSS feed field
I'm unable to view the feed via the link you've provided - seems like it may not allow public access. In any case, see a working example below using an example public RSS feed.

{% set params = {
    url: 'http://www.feedforall.com/sample.xml',
    type: 'xml',
    element: 'item',
} %}

{% set feed = craft.feedme.feed(params) %}

{% for node in feed %}
  {{ node.category.attributes.domain }}
{% endfor %}