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Metadata is  data about data. Two types of metadata exist: structural metadata and descriptive metadata. Structural metadata is data about the containers of data. Descriptive metadata uses individual instances of application data or the data content.hile the metadata application is manyfold covering a large variety of fields, there are specialised and well-accepted models to specify types of metadata. Bretheron & Singley (1994) distinguish between two distinct classes: structural/control metadata and guide metadata.
Metadata means data about data. In the database world, metadata refers to the schema, the structure of the database. One significant complication is that the SQLAlchemy view of a database's structure may be different than the structure at the SQL level.Accordingly, there are three ways to use metadata to work with an SQL database.If you are working with an existing SQL database, you can ask SQLAlchemy to use reflection to determine the structure of the database, then use it as it is. MetaData instance is basically a container for Table instances that describe its constituent tables. For two different ways to call its constructor, see Section 4.1, âReflection: finding out the structure of an existing SQL databaseâ and Section 4.2, âBuilding your own schemaâ .