does anyone have any techniques for handling user errors with webservices?

for example you have a web service that queries a database for records but no 
records are found (not a terribly good example, but lets pretend that no 
records could mean a number of different things).. 

do you use a webservice fault (exception) to say that theres no records 
because...? or do you have the operation return a "response" type message that 
contains a nullable object for the records (if there is any) and a list of 
error messages if there isn't?

When i started creating webservices in java i would have just thrown a bunch of 
custom faults for my user error handling.. but faults come back in a soap 
response with a 500 Internal server error http header and this just doesn't 
seem right. Plus i've since been programming using VB in dotnet *vomits* and 
exceptions (which i see faults as) are used a little differently to the way 
they are in java, moreso for exceptional circumstances rather than handling 
possible expected outcomes.

So I'm really just wondering how you guys handle expected user 
errors/responses? Are there any recommended or standard patterns for ways to 
handle these circumstances?

thanks
d

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