Y Layouts let you define different layout renderings for different themes. Any module or active theme in the subtheme chain can define a layout using a particular protocol.
This is the order of discovery for layouts. Each layout is defined with the template API.
layouttheme-layout-skin(theme setting)theme-layout(for each theme up the subtheme chain)theme-layout_default(for each theme up the subtheme chain)layout_default
What this means is that if you want to provide a basic, generic, plain-vanilla layout with your application, you should define it in the layout_default protocol.
Individual themes and subthemes should define their default layouts in the exampletheme-layout_default protocol.
Layout overrides for particular themes should be defined by the exampletheme-layout protocol.
For themes that allow different skins, then layouts for each skin should be defined within the exampletheme-layout-exampleskin protocol.
If you want to trump all other layout definitions and take complete control, then use the layout protocol.
