A relationship collection is the set of versioned relationships that connect a particular source object version to a set of one or more target objects. All of the relationships in the collection must conform to the same relationship type.
Use the IRelationshipCol interface to manage the Repository relationships that belong to a particular relationship collection. With this interface, you can:
| IUnknown Method | Description |
| QueryInterface | Returns pointers to supported interfaces. |
| AddRef | Increments the reference count. |
| Release | Decrements the reference count. |
| IDispatch Method | Description |
| GetIDsOfNames | Maps a single member and a set of argument names to a corresponding set of dispatch identifiers. |
| GetTypeInfo | Retrieves a type information object, which can be used to get the type information for an interface. |
| GetTypeInfoCount | Retrieves the number of type information interfaces that an object provides (either 0 or 1). |
| Invoke | Provides access to properties and methods exposed by an Automation object. |
| IRelationshipCol Method | Description |
| Add | Adds a relationship to the collection. |
| get_Count | Retrieves a count of the number of relationships in the collection. |
| _NewEnum | Retrieves an enumeration interface pointer for the collection. |
| get_Source | Retrieves an interface pointer for the collection's source object. |
| get_Type | Retrieves the object identifier for the collection's definition object. |
| Insert | Inserts a relationship into a specific spot in a sequenced collection. |
| get_Item | Retrieves an IRelationship interface pointer for the specified relationship. |
| Move | Moves a relationship from one spot to another in a sequenced collection. |
| Refresh | Refreshes the cached image of the relationship collection. |
| Remove | Removes a relationship from the collection. |
The IRelationshipCol interface is very similar to the ITargetObjectCol interface. Use the IRelationshipCol interface when you are primarily interested in working with relationships. Use the ITargetObjectCol interface when you are primarily interested in working with objects.