A bookmark is describes a static place in the world.  Its a place you wish to label for revisit.  Its somewhere you wish to come back because its properties still serve you some value.  I created a bookmark today that I should have been creating all along.  I bookmarked a Google search that had more results then I had time or energy to read. 

Then it occurred to me that my url was actually a search instruction to the google machine and this bookmark was, in fact, a macro.  Gives me an interesting idea for automated testing...