3.0.0 beta1

* Removed Attribute.CLONE support in the interests of simplicity.

Was not being used. Can add support if real demand for it exists.

* Changed "set" and "get" configuration properties for setter and

getter methods to "setter" and "getter" respectively.

* Added support for setter to return Attribute.INVALID_VALUE

to prevent attribute state from being changed.

This allows developers to combine setter and validator

functionality into one method if performance optimization

is required.

* "validator" is now invoked before "setter". Didn't make sense

to validate values which were already massaged by the setter.

* Renamed xxxAtt and xxxAtts methods to xxxAttr, xxxAttrs for

consistency.

* After listeners are only notified if attribute value really

changed (using ===).

* Extending classes can now overwrite ATTRS configuration propreties

from super classes, including writeOnce and readOnly attributes.

The ATTRS configurations are merged across the class heirarchy,

before they are used to initialize the attributes.

* addAttr now prevents re-adding attributes which are already

configured inorder to maintain consistent state.

* Event prefix wrapper functions (on, after etc.) removed -

Event.Target now accepts an event prefix configuration value

* Added additional log messages to assist with debugging.

* Attribute change events are no longer fired for initial set.

* Split up State add/get/remove into add/addAll, get/getAll, remove/removeAll

to avoid having to create object literals for critical path [ add/get single

key values ].

* Attribute getter, setter, validator now also receive attribute name

as the 2nd arg (val, name).

* If Attributes initialized through addAttrs have a user provided value

which is not valid, the initial attribute value will revert to the

default value in the attribute configuration, if it exists.

* reset() no longer resets readOnly or writeOnce attributes. Only publically

settable values are reset.

* Added modifyAttr method, to allow component developer to modify configuration

of an attribute which has already been added. The set of attribute configuration

properties which can be modified after is has been added are limited to getter,

readOnly, writeOnce and broadcast.

3.0.0PR2

* Added valueFn support, to allowing static

attribute values configuration to set instance

based values.

* Added reset method.

* Added private setter for use by class implementation

code to set readOnly, writeOnce values.

3.0.0PR1 - Initial release

Module Name: "attribute"

Documentation: http://developer.yahoo.com/yui/3/attribute

The Attribute utility allows you to add attributes to any class

through an augmentable Attribute interface. The interface adds

get and set methods to your class for attribute access, in

addition to supporting change events allowing you to listen

for changes in attribute values.