A previous post on this blog was called A Business Oriented Data Mind Map. In here, I took a snapshot of my brain when thinking through some different kinds of data used within doing business.
One omission of a kind of data was though metadata. So, let me just think metadata into those other kinds of data:
Metadata is data about data. Therefore, metadata applies to any other kind of data.
Metadata could be part of structured data but is unfortunately often only sparsely treated as data dictionaries and does only in a few cases reach the level of a business glossary not to say being continuously maintained in such a glossary. Thus, a lot of structured data is not used as the valuable information it could be.
Metadata should be applied to unstructured data. If not, unstructured data will just be data, and will not be transformed to information and used as knowledge.
Metadata must be used to link data on premise and data in the cloud. Metadata is the key to syndicate local data and global within an enterprise and across business ecosystems. Metadata must be used to combine internal and external data and make the transformation from data over information and knowledge to wisdom.
Liliendahl on Data Quality 
Metadata is information (that is where business intelligence plays a role), metainformation is knowledge and metaknowledge is wisdom. Right?
That is a nice to put it, Al