When an EDC, ADC or REST Datasource is added to a vocabulary, the Vocabulary editor is modified to place a Datasource pulldown menu above the Vocabulary tree, as illustrated:

Figure 1. Datasource not selected

After a Datasource is selected, the tree icons take on database 'decorations' on each persisted entity and attribute. The list of attributes in each persisted entity is re-arranged such that the one or more attributes that comprise the entity identity, the Primary Key, are at the top of each list. Here, the EDC Datasource is selected and the database decorations are shown:

Figure 2. EDC Datasource selected

When more than one Datasource has been defined in a Vocabulary, clicking the pulldown lets you choose which Datasource you want to view, as illustrated:

Figure 3. Selecting from multiple Datasources

In the following illustration, the Patient Datasource is showing its persisted elements and keys, and the Datasource's section of the Properties panel is decorated with an orange arrow to indicate that it is the Datasource in the current view:

Figure 4. Patient Datasource keys and persistent elements
When you toggle the Datasource selector to the Treatment Datasource, it decorates its persisted elements and keys, and the Datasource's section of the Properties panel is decorated with an orange arrow to indicate that it is the Datasource in the current view:
Figure 5. Treatment Datasource keys and persistent elements

The next sections of this document take you through setting up and experiencing each type of data connectivity. That is followed by advanced material for each type of Datasource.