I am: <%= current_resource.page_id %>

URL1: <%= url_for "frontmatter" %>
URL2: <%= url_for "page2" %>
URL3: <%= link_to "Hi", "page3" %>
URL4: <%= link_to "Sym", :"something-else" %>
URL5: <%= link_to "Imp", :implicit %>
URL6: <%= link_to "Foldern", "folder/foldern" %>
URL7: <%= link_to "Feed", "feed.xml" %>

<%# If custom proc %>
URL8: <%= link_to "Imp", "implicit.html-foo" %>
URL9: <%= link_to "Foldern", "folder/foldern.html-foo" %>
URL10: <%= link_to "Feed", "feed.xml-foo" %>