"Metadata" can also be painful. One abstraction's metadata is another's "data data". For example, there was a structured store where each entity was a byte arr

"Metadata" can also be painful. One abstraction's metadata is another's "data data". For example, there was a structured store where each entity was a byte array ("blob") with certain searchable, indexed "metadata". (The "data data" was the blob itself.) However, demands on the structure required certain additional fields regarding the content of that "metadata" that were allowed to break the contract of the original "metadata" and were therefore metadata on the metadata. I fell out of my chair, hoping the "kick" would bring me up a level. It didn't. I wasn't dreaming.