Array Tag of the Lookup View Definitions File
The array tag defines a set of types that is available for the SalesBook control. The user cannot use the SalesBook control to choose an object type until you describe this type in the array tag. Also, you must specify the type ID as a value attribute of the item tag.
The following code is an example of the array tag:
<array key="all_lookup_types">
<item value="Account"></item>
<item value="Contact"></item>
<item value="Opportunity"></item>
</array>