tagging is what happens when you allow an artifact to exist under more than one hierarchy at the same time. The progression usually goes. "we want to label ou

tagging is what happens when you allow an artifact to exist under more than one hierarchy at the same time. The progression usually goes. "we want to label our things." "There is a natural hierarchy that we want to be reflected in our labels. "Some things are not labeling well. instead use multiple labels per thing." "There is a natural hierarchy that we want to be reflected in our labels." The unix files system is a good example of the latter. it favors the hierarchy but allows each file to have many names if that is what is required. The main weakness of the unix filesystem is that there is no reverse map, that is, finding a file from its name(s) is simple. finding the names from the file involve searching the whole filesystem.