What are the three major types of navigation systems? Explain the differences among them.
What will be an ideal response?
A hierarchical navigational system implements a hierarchical organizational system and provides users with a top-down view of a site. Ad hoc systems serve a hypertext organizational structure and typically appear as embedded links in a Web page. A database navigational system implements a database organizational structure. A user types in a word or phrase to find related pages. Most sites should have some form of hierarchical navigational system. Ad hoc systems involve links that are added typically because a hierarchical system can’t accommodate a particular association. Database navigational systems typically appear as an ancillary system but rarely as the primary navigation system for a site.
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A ________ is formed when an activity diagram’s transition arrow wraps from an action state back to a merge symbol.
a) loop-continuation condition b) merge c) loop d) None of the above.
__________ ensures that only code, data, or stack segment descriptors are used and that they are used as intended.
a. Limit checking b. Type checking c. Memory protecting d. MMX technology