Use scannable layout (categorize the content, use multiple heading levels, use visual elements and bulleted lists which break the flow of uniform text blocks).

These elements are all extended from the section heading class in the base topic, which allows a single heading element to contain multiple paragraphs.

This paper takes heading multiple area automatic commerce system (HDPOS5) for example, applied the improved base on position and role access control model to system, ensure the security of the system.