Finds out whether a user is already enrolled for a specific trait.
trueif a template for the specified class and trait is available, i.e. a verification of the user is possible.
false when a template for the specified class and trait was not found, i.e. a verification of the user is not possible.
In this case the user needs to enroll the specified trait before performing any biometric action on this trait.
Sometimes it is useful to know whether there is a template available for a specific user and trait before a client tries to perform a verification of this user using this trait. If no template is available, i.e. the user is not yet enrolled, the client could use another authentication mechanism and send the user to the enrollment procedure.
This API has a fault contract of type BioIDWebServiceFault which is used for fatal errors like invalid arguments or missing service, etc.