taglib html

とりあえず仕様書 9.5 Standard HTML RenderKit Tag Library を読んでおこう。
must関連はメモ。

The tag library descriptor for this tag library (and the corresponding tag handler
implementation classes) must meet the following requirements:

■For a non-null action attribute on custom actions related to UICommand
　components (commandButton, commandLink), the setProperties() method
　of the tag handler implementation class must:
　■If the specified String value is not a value binding expression, create a
　　MethodBinding instance that will return this value when its invoke()
　　method is called, and store it as the value of the action attribute on the
　　underlying component.
　■Ohterwise, create a MethodBinding instance for the specified expression, and
　　store that instance as the value of the action attribute on the underlying
　　component.

■For other non-null attributes that correspond to MethodBinding attributes on
　the underlying components (actionListener, validator, 
　valudChangeListener), the setProperties() method of the tag handler
　implementation class must:
　■Throw an exception if the specified String value is not a value binding
　　expression.
　■Create a MethodBinding instance for the specified expression, and store that
　　instance as the value of the corresponding component property.

■For any non-null id, scope, or var attribute, the setProperties() method of
　the tag handler implementation class must simply set the value of the
　corresponding component attribute.