Layering and User Interface
Owners of various layers have different responsibilities and constituencies
Five Logical Layers (and responsibility)
user experience - no one and everyone.
user interface - implementers.
recommended setting - consumer advocates and other parties trusted by users.
grammar - W3C.
vocabularies - IPWG and others.
Example questions: where is the concept of a child represented?
Must be explicit about scope, and sometimes provide hints or recommendations to other layers.
Cranor and Reagle