Definition
1. Metadata is data (information) that provides information about other data.
2. Three distinct types of metadata exist: structural metadata, descriptive metadata, and administrative metadata.
3. Metadata means "data about data". Although the "meta" prefix (from the Greek preposition and prefix μετά-) means "after" or "beyond", it is used to mean "about" in epistemology. Metadata is defined as the data providing information about one or more aspects of the data; it is used to summarize basic information about data which can make tracking and working with specific data easier. Some examples include: Means of creation of the data, Purpose of the data, Time and date of creation, Creator or author of the data, Location on a computer network where the data was created, Standards used, File size
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Sources
http://www.merriam-webster.com/dictionary/metadata, http://marciazeng.slis.kent.edu/metadatabasics/types.htm, https://en.wikipedia.org/wiki/Metadata#Definition
Metadata in oedb
In the oedb, the metadata is stored in a comment as a JSON string.
The SQL example is on GitHub.
Different concepts for metadata were compared, harmonized and simplyfied:
