TEMPLATE DIRECTIVES

  GET       - evaluate and print a variable or value
	      [%  GET variable %]
              [%      variable %]
              [%      hash.var %]
              [% "value: $var" %]

  SET       - assign a value to a variable
	      [% SET variable = value %]
              [%     variable = other_variable
                     variable = 'literal text @ $100'
                     variable = "interpolated text: $var"
                     list     = [ val, val, val, val, ... ]
		     list     = [ val..val ]
                     hash     = { var = val, var = val, ... }
              %]

  DEFAULT   - as SET above, if variable(s) not set
              [% DEFAULT variable = value %]

  INCLUDE   - include another template file/block, localising vars
              [% INCLUDE template %]
              [% INCLUDE template  var = val, ... %]

  PROCESS   - as above, without localising variables
              [% PROCESS template %]
              [% PROCESS template  var = val, ... %]

  FOREACH   - repeat block for each value in a list
	      [% FOREACH variable = [ val, val, val ] %]
              [% FOREACH variable = list %]
              [% FOREACH list %]
                 content...
                 [% variable %]
              [% END %]

  WHILE     - iterate while condition is true
              [% WHILE condition %]
	         content
	      [% END %]

  IF/UNLESS - process block if condition is true/false.
              [% IF condition %]
                 content
	      [% ELSIF condition %]
		 content
	      [% ELSE %]
		 content
              [% END %]

              [% UNLESS condition %]
                 content
              [% # ELSIF/ELSE as per IF, above %]
	         content
              [% END %]

  BLOCK     - define a template block for INCLUDE or PROCESS
              [% BLOCK template %]
                 content
	      [% END %]

  MACRO     - create a named macro for some other directive or block
              [% MACRO directive %]

  FILTER    - post-process block through a filter
              [% FILTER name %]
              [% FILTER name( params ) %]
              [% FILTER alias = name( params ) %]
                 content
              [% END %]

  USE       - load a "plugin" module
              [% USE name %]
              [% USE name( params ) %] 
              [% USE var = name( params ) %]
              ...
              [% name.method %]
              [% var.method %]
              
  CATCH     - define block to catch an exception
              [% CATCH etype %]
                 content...
                 [% e.type %]  [% e.info %]
              [% END %]

  THROW     - throw an exception
              [% THROW etype info %]

  ERROR     - generate an error message (default: to STDERR)
              [% ERROR info %]

  BREAK     - break out of FOREACH/WHILE
              [% BREAK %]
     
  RETURN    - stop processing current template
              [% RETURN %]

  STOP      - stop processing all templates and return to caller
              [% STOP %]

  COMMENT   - ignored and deleted
              [% # this is a comment  %]

  TAGS      - define new tag characters (default: [% %])
              [% TAGS <!-- --> %]