[jsr-314-open] default values for composite component attributes

I'm not seeing default values applied to composite component attributes when those attributes are not specified in the using page. I'm also not seeing an difference in behavior in my app when I specify that an attribute is required and I don't supply it. The javadocs for the composite:attribute required attribute simply say: "True if the page author must supply a value for this attribute." But it gives no insight as to what should happen when the page author fails to supply a value. Do we throw an exception? The result of not providing a required attribute should be specified in the javadocs, IMO. david