Requirement 9.2.1: A WIS Discovery Metadata record describing data for global exchange via the WIS shall have a gmd:MD_Metadata/gmd:fileIdentifier attribute formatted as follows (where {uid} is a unique identifier derived from the GTS bulletin or file name): urn:x-wmo:md:int.wmo.wis::{uid}
TEST METHOD:
In the instance document under test, validate that the gmd:fileIdentifier element conforms to the following regular expression:
