Try an expriment. Go to https://uddi.ibm.com/ubr/registry.html and ask the computer equivalent of "Are there any web services that book flights?"
UDDI Find requires choice of taxonomy and even
then you will not be able to search on services that
"book flights". This is because
UDDI does not contain the actual service descriptions, which are distributed.
But UDDI does not perform distributed search.
Suppose it did and found the WSDL
description of the service and its operations.
How would a software program know if a service booked flights or not?