A directive is an extension to HTML (or XML) used to create correspondence or user displays and forms.
The use of directives is deprecated except for list view rules and summary view rules. As a best practice for improved performance and debugging, use JSP tags rather than directives in new Version 5 development, except for list view rules. Accept the default value JSP
in the Generate for field of the HTML tab of stream rules: harness, section, XML, HTML, flow action, control, and correspondence. Conversion of directives to equivalent JSP tags is automatic, fast, and reliable.
The syntax for a directive starts and ends with curly brace characters { and }.