##
7.8 #block

The template:

      #block content
      This page is under construction.
      #end block

The output:

      This page is under construction.

This construct generates a method `.content` in the same structure as `.printArg` above, containing the write code:

      write('This page is under construction.\n')

In the main method, the write code is:

      self.content(trans=trans) # generated from ('content', '#block content')
          # at line 1, col 1.

So a block placeholder implicitly passes the current transaction to the method.