Reported by @petervwyatt:

The metanorma list-extensions command is missing the metanorma-taste outputs, e.g. pdfa, icc.

We should also reformat this for tastes such that it also describes for a taste:

• base flavor for the taste
• what extensions are enabled based on that flavor for the taste

"metanorma list-extensions" gives me:

Supported extensions per type:
  standoc: xml, presentation, rxl, html, doc and pdf.
  iso: xml, presentation, rxl, html, html_alt, doc, pdf, sts and isosts.
  iec: xml, presentation, rxl, html, doc, pdf and sts.
  ieee: xml, presentation, rxl, html, doc, pdf and ieee.
  ietf: rxl, xml, rfc, html, txt and pdf.
  generic: html, doc, xml, presentation and rxl.
  bipm: html, xml, presentation, rxl and pdf.
  ribose: html, doc, xml, presentation, rxl and pdf.
  cc: html, doc, xml, presentation, rxl and pdf.
  iho: html, doc, xml, presentation, rxl and pdf.
  jis: xml, presentation, rxl, html, pdf and doc.
  ogc: xml, presentation, rxl, html, doc and pdf.
  itu: xml, presentation, rxl, html, doc and pdf.
  plateau: xml, presentation, rxl, html, pdf and doc.