Editing WordPerfect (section)

====Streaming code architecture====
A key to their design is its streaming code architecture that parallels the formatting features of [[HTML]] and [[Cascading Style Sheets]]. Documents are created much the same way that raw HTML pages are written, with text interspersed by tags (called "codes") that trigger treatment of data until a corresponding closing tag is encountered, at which point the settings active to the point of the opening tag resume control. As with HTML, tags can be nested. Some data structures are treated as objects within the stream as with HTML's treatment of graphic images, e.g., footnotes and styles, but the bulk of a WordPerfect document's data and formatting codes appear as a single continuous stream. A difference between HTML tags and WordPerfect codes is that HTML codes can all be expressed as a string of plain text characters delimited by greater-than and less-than characters, e.g. <code language=HTML>&lt;strong&gt;text&lt;/strong&gt;</code>, whereas WordPerfect formatting codes consist of [[hexadecimal]] values.