We'll call the process of attaching metadata to a page "Tagging".
Here we rate a page as excellent by tagging it with the appropriate tag:
Note that a tag consists of an attribute (here: Rating) and a value (here: x-x-x-x-x).
In the same way we mark it as belonging to "Product" "Mod_jk" and having the "Format" "Article".
The corresponding tags are immediately shown in the sidebar, along with the information who tagged it at what time, as well as an "X" to remove the tag.
Whenever the page is loaded in the main window, the sidebar will display these tags.
For more on tagging in the page SimpleTagging
Navigation by metadata