gistfile1.txt

…

#
# Regular template
#
page.body {
  content.side = Template
  content.side.templatePath = "… Main.html"
  …
}

#
# Alternative template
#
pageAlternative < page {
  body.content.side.templatePath = "… Alternative.html"
}

#
# Define a new "case" which becomes active on a certain condition (for example if the current node is of a certain type).
# If that case matches, render the specified TypoScript object (instead of "page")
#
root.pageAlternativeCase {
	condition =  ${q(node).is('[instanceof Acme:SpecialType]')}
	renderPath = '/pageAlternative'
}