An interface that can be used to allow MutableAttributeSet
implementations to use pluggable attribute compression
techniques. Each mutation of the attribute set can be
used to exchange a previous AttributeSet instance with
another, preserving the possibility of the AttributeSet
remaining immutable. An implementation is provided by
the StyleContext class.
The Element implementations provided by this class use
this interface to provide their MutableAttributeSet
implementations, so that different AttributeSet compression
techniques can be employed. The method
getAttributeContext
should be implemented to
return the object responsible for implementing the desired
compression technique.