b49e4601__Language_Meanings___TechWhirl__Description
[DITA Term] Semantic markup [Plain Language Term] Content has meaningful tags applied [Description] 
Tagging applied to a piece of content that indicates the context of the information, or what type of information it is.For example, the title of a topic would appear in a element (remember, there’s no formatting in XML) and the information that tells the user why they would perform a task is in a element. Once you have the appropriate tags around the appropriate content, you have applied semantic markup and can then apply formatting to all elements, for example, with one formatting transform rule.