1. PageParser

    The PageParser class builds Block hierarchies from a stream of tokens.

  2. The first step in loading a page is to create an empty Block hierarchy, and return this to the caller. This can be added to a set of pages, and ViewPanel objects can be created which display the (empty) Block hierarchy.

  3. Later, the caller asks that the page actually be loaded. If any ViewPanels displaying the hierarchy have been created, then the loading process will generate repaint requests and the block hierarchy will be displayed as it is being loaded.