Simple DataLink question: Can links be relative?

[Tom McGlynn (NASA/GSFC Code 660.1)]

In a service descriptor  (4.1 in the sDataLink tandard) can I use a relative URL to describe the 
location of the service to be invoked in the accessURL?

Similarly can relative URLs be used in  a DataLink results table (section 3.2) in the accessURL 
column of  the table?

     Tom McGlynn