<param> elements are used to define arguments to the custom loader’s constructor.
Name of the parameter. This attribute is defined to document the argument. (By default, the name is not defined.)
Required: Full Java class name of the argument’s type. For example, a string argument will set class="java.lang.String".
Required: Value of the argument.
Format of the value. This attribute is typically used for date arguments, and is used by the loader framework to parse the value string into the required class. (By default, the format is not defined.)