Parameters are one way that data may be stored for a Joomla! Extension. Each parameter consists of two parts:
Joomla! defines 21 core parameter types, each of which gives a predefined behaviour and appearance in the back-end. This makes it very easy for developers to implement a range of form data entry types (text boxes, radio buttons, calendar selectors and so on) with a minimum of effort. This behaviour and appearance is determined by the
type attribute of the
<param> element. See J1.5:Standard parameter types for a complete list and details of each type.