When you manage a Zope server using the tree control, it looks like you're navigating a file system. But you're not, you're navigating ZODB. When you create a folder in ZODB, one of the objects that it will always contain is a DTML document called index_html. Conceptually, it corresponds to the default HTML page in a Web server directory, but it's not a file, it's an object, whose default behavior is to read a DTML template, process the tag-language constructs it contains, and renders an HTML result.
In this example, the index_html method of a folder includes an instance of the <dtml-calendar> widget. Here's the calendar-related piece of index_html:
In this volume of Best of BYTE, we explore the emergence of some heuristic algorithms. Although we have only scratched the surface of this intriguing subject, we hope we've suggested the potential of the synthesis of heuristics and algorithms.
