Apple WebObjects 3.5 - Manual (Page 70)

Chapter 5 WebObjects Viewed Through Its Classes
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Figure 17. Request-Response Loop: Page Level
Two major branches of these objects descend from WOElement:
WOComponent objects, which represent components, and
WODynamicElement objects, which represent dynamic HTML elements on
the page. For details on how this happens and for more on these classes, see
“How HTML Pages Are Generated” (page 82).
Four classes are involved at this level:
• WOComponent (in Java, Component)
Represents a integral, reusable page (or portion of a page) for display in a
web browser.
• WOElement (in Java, Element)
Declares the three request-handling methods: takeValuesFromRequest:inContext: ,
invokeActionForRequest:inContext: , and appendToResponse:inContext: . WOElement is an
abstract class. Each node in an object graph, which represents the HTML
elements of a component and their relationships, is an object that inherits
from WOElement.
• WODynamicElement (in Java, DynamicElement)
An abstract class for subclasses that generate particular dynamic elements.
HTTP server adaptor
Request
Response
response
page
transaction 1
request
page
session 1
response
page
transaction 2
request
page
application
session store
session 2