||SQL Server Tips by Gama and Naughter
A UDF can be bound to the schema of any objects it references, such
as tables, views, and other UDF's. Binding is specified with the
SCHEMABINDING clause and the name of the object to be bound. The
main advantage of schema binding is that if a UDF is bound to an
object, the objectís schema cannot change unless the schema binding
is dropped first.
Prerequisites for binding
All views and UDF's referenced by the function must be
All objects referenced by the function must be from the same
database as the UDF.
All objects referenced by the function require the user to have
All objects referenced by the function are not referenced using
a two-part name.
The above book excerpt is from:
Turbocharge Database Performance with C++ External Procedures
Joseph Gama, P. J. Naughter