Returns the file server from a DataLink value with a linktype of URL. The argument must be an expression that results in a value with data type of DataLink.
Example:
Given a DataLink value that was inserted into column COLA of a row in table TBLA using the scalar function:
DLVALUE('http://dlfs.almaden.ibm.com/x/y/a.b','URL','A comment')
then the following function operating on that value:
DLURLSERVER(COLA)
will return the value: DLFS.ALMADEN.IBM.COM