When editing an item, you are required to provide its URI. The URI is the internal label used in the system to identify the item. URIs are also used for fields with pre-defined values.
When you create an item using the services, the URI for that item will typically be returned.
To obtain the URI for multiple items, use the GetAll operation for that type of data. You will receive a list of all items of that type and their URIs.
If you don’t need to obtain the URI programmatically, use the Fields tab to find the URI:
All of the items of that type are listed, with their display name.
The URI for the selected item is displayed.