Whether you start with an existing stored procedure or an existing Web page, you see that with just a few changes and additions, you can create dynamic Web pages that perform database queries and other operations, and display the results from a Web browser. First things first, the file for a PL/SQL server page must have the extension .psp. Table 12.1 provides a summary for the four types of PSP Server Page elements.
A PSP directive is simply a statement that provides the PSP compiler information about the page it is about to load into the database. Here is the syntax for a PSP directive:
<%@ directive attribute="value" [ attribute="value" ... ] %>
Don’t forget the % inside the <, and just before ...