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# Chapter 32. Metadata

Metadata is data describing the data structure.

Each edge of a graph carries some data. This data must be described using metadata. Metadata describes both the record as a whole and all its fields.

Records can be of different types, each field can have different data type. See Records and Fields

- Date and Time Format

- Numeric Format

- Locale

- Time Zone

- Autofilling Functions.

The metadata can be either internal, or external (shared). Metadata can also be created dynamically or read from remote sources. See Metadata Types.

- Internal Metadata.

- External (Shared) Metadata.

- Dynamic Metadata

- Reading Metadata from Special Sources

For details on metadata propagation see Auto-propagated Metadata

Metadata can be created from:

- Flat file: See Extracting Metadata from a Flat File.

- XLS(X) file: See Extracting Metadata from an XLS(X) File.

- DBase file: See Extracting Metadata from a DBase File.

- Database: See Extracting Metadata from a Database.

- By user: See Creating Metadata by User.

- Lotus Notes: See Extracting Metadata from Lotus Notes.

- Cobol Copybook

- Merging existing metadata: See Merging Existing Metadata.

Metadata editor is described in Metadata Editor

For detailed information about changing or defining delimiters in `delimited` or `mixed` record types see Changing and Defining Delimiters.

Metadata can also be edited in its source code. See Editing Metadata in the Source Code.

Metadata can serve as a source for creating a database table. See Create Database Table from Metadata.

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