"minimal list of must have icons"

[Vasiliy Faronov]

Hello.

The Icon Theme Specification 0.8.90, according to the Overview section,
aims to "provid[e] a minimal list of must have icons, and a larger list
with many more examples to help with the creation of extended icons
for third party applications, devices, and new MIME types."[1]

However, as far as I can tell, the specification only contains one list
of icons along with their names[2]. No separation by priority.

Is this the "must have" list, or the "larger one"?

In general, are there any recommendations on the priority of icons
(i.e. which ones are more essential)?

[1] http://standards.freedesktop.org/icon-naming-spec/latest/index.html
[2]
http://standards.freedesktop.org/icon-naming-spec/latest/ar01s04.html