Market Data Definition Language (MDDL)
Google
The Financial Information Services Division of the Software & Information Industry Association
MDDL 2.5-beta : componentIdentifier
MDDL 2.5-betaSchema DocumentationNo Graphics?
Index: MDDL 2.5-beta Schema Documentation
Element: componentIdentifier
Description: Identifies (one of) the underlying instrument(s) for this component. See "instrumentIdentifier".
Used by: component  selectionItem 
Attributes:  
Uses: sequence  code  name  previousCode  instrumentStatusType 
Classification: Container "property"
Diagram: