cheat sheets.

hAtom

<% render_hfeed(options?) do ... end %>
<% render_hentry(id, options?) do ... end %>

  Render ol with class hfeed, or li with the class hentry and id. Options passed
  to HTML element.

<%= hentry_title(title?, options?) { ... } %>
<%= hentry_content(content?, options?) { ... } %>

  Returns header with class entry-title, or element with class entry-content.
  Content pass as argument or returned from block, options passed to wrapping
  element. Use :level to specify header level (default 2), :tag to specify
  content element (default p).

Other

<%= hcard(values) %>

  :fn           Formal name
  :given-name   Given name (alternative to :fn)
  :family-name  Family name (alternative to :fn)
  :url          URL of person/entity (results in link)
  :photo        URL of photo, or hash of options for img tag
  :html         Options to pass to wrapper element

<%= Time.microformat(type, format?) { ... } %>

  Formats time using the date/time pattern, returns abbr element. First argument
  is date/time type (e.g. :published). Human formatted: using second argument
  (see strftime), result of block, or self.to_s.