Every edge of any graph carries some data. This data must be described using metadata. So, each of your graphs containing some edge or edges contains metadata as well. These can be either internal, or external (shared).
For information about data types and record types that can be used in metadata see Data Types and Record Types.
When working with various data types, the formatting or locale can also be specified. See:
Date and Time Format for CTL1 or Date and Time Format for CTL2
Numeric Format for CTL1 or Numeric Format for CTL2
Each metadata can be created as:
Internal: See Internal Metadata.
Internal metadata can be:
Externalized: See Externalizing Internal Metadata.
Exported: See Exporting Internal Metadata.
External (shared): See External (Shared) Metadata.
External (shared) metadata can be:
Linked to the graph: See Linking External (Shared) Metadata.
Internalized: See Internalizing External (Shared) 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.
Metadata can also be created dynamically or read from remote sources:
Dynamic metadata: See Dynamic Metadata.
Read from special sources: See Reading Metadata from Special Sources.
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 Creating Database Table from Metadata and Database Connection.