Question: In the context of extending the PSS profile schema, what happens when the TSG responsible for the document updates the base vocabulary schema?
Option 1: A new unique namespace is assigned to the updated schema.
Option 2: The existing namespace is modified to accommodate changes.
Option 3: No namespace changes are made; only attribute values are updated.
Option 4: The update is not allowed to ensure backward compatibility.
Explanation: Assigning a new unique namespace upon updating the base vocabulary schema ensures backwards compatibility and allows for clear differentiation between versions. This approach also maintains the integrity of existing implementations while providing a structured path for evolution, which is particularly important in telecom standards for seamless interoperability and to avoid conflicts with existing deployments.