The InformationSourceType details the source of a given data entry.
| Field Name | Type | Description | 
|---|---|---|
| Identity0..1 | IdentityType | 
        
          
        
           The Identity field is optional and specifies the identity of the information source. This field is implemented through the xsi:type extension mechanism. The default type is CIQIdentity3.0InstanceType in the http://stix.mitre.org/extensions/Identity#CIQIdentity3.0-1 namespace. This type is defined in the extensions/identity/ciq_identity.xsd file or at the URL http://stix.mitre.org/XMLSchema/extensions/identity/ciq_identity/1.0/ciq_identity.xsd. 
 Those who wish to express a simple name may also do so by not specifying an xsi:type and using the Name field. 
  | 
    
| Contributors0..1 | ContributorsType | 
        
           The Contributors field is optional and enables description of the individual contributors involved in this instance.  | 
    
| Time0..1 | TimeType | 
        
           The Time element is optional and enables description of various time-related attributes for this instance.  | 
    
| Tools0..1 | ToolsInformationType | 
        
           The Tools element is optional and enables description of the tools utilized for this instance.  | 
    
| References0..1 | ReferencesType | 
        
           The References field is optional and enables specification of references to information source material for this instance.  |