@Chapter @Title { Principles } @Tag { principles } @Begin @LP The document formatting language Lout is based on just four key ideas: objects, definitions, cross references, and galleys. In this chapter we concentrate on them, postponing the inevitable details to later chapters. @BeginSections @Include { pri_obje } @Include { pri_defi } @Include { pri_cros } @Include { pri_gall } @EndSections @End @Chapter