A style sheet is a feature in desktop publishing programs that store and apply formatting to text.
Style sheets are a common feature in most popular desktop publishing and word processing programs, including Corel Ventura, Adobe InDesign, Scribus, PageMaker, QuarkXPress, WordPerfect, and Microsoft Word, though they may be referred to using slightly different terminology.
In this case, the style could be programmed to apply the bold, sans serif typeface at the start of a new paragraph until it encounters a colon.
Style sheets help publications maintain consistency, so common elements such as story text, headlines and bylines always appear the same.
A user with proper administrative access can make the change to the master style sheet and then "send" the revised style sheets to all users, so the change is automatically reflected.