Action 2277: DCAT

I reviewed Data Catalog Vocabulary (version 3)
<https://www.w3.org/TR/vocab-dcat-3/> for Action 2277
<https://www.w3.org/WAI/APA/track/actions/2277> and have the
following comments:

   1. The addition of an Accessibility Considerations section at the same
   level of Security and Privacy can help increase awareness of accessibility
   issues in data.
   2. In an Accessibility Considerations section, I'd like to see a
   recommendation to, when possible, enforce alternative text for non-text
   data resources through the DCAT profile mechanisms or systems supporting
   the creation and editing of such data. This will help applications using
   the data to conform to WCAG 1.1 Text Alternatives
   <https://www.w3.org/TR/UNDERSTANDING-WCAG20/text-equiv.html>.