[db-wg] -V database query semantics

Could someone from RIPE clarify the semantics for the -V query?

In the database query reference manual, section 2.6 it says:

> -V --client <client-tag>   Sends information about the client to the server. 

But in section 2.11, it says:

> The database server provides a facility for such proxy clients that
> allows accounting to be based on the IP address of the clients using the
> proxy to query the RIPE Database and not on the IP address of the proxy
> server. This is done using the “-V” flag as follows:
> 
> -V <version>,<ipv4-address>                   
> 
> where 
> 
> <version> is a client tag that usually represents the software version
> that the proxy uses
> <ipv4-address> is the IPv4 address of the client that queries the
> database using the proxy

According to the source code, the argument for the -V parameter is passed
into the QueryFlag.CLIENT variable and then parsed using getProxyIp().  If
the format looks like "version,ipv4addr" then the argument is passed to the
proxy accounting mechanism for rate limiting.  But if the argument is not
formatted like this, it looks like the "-V" parameter is ignored.

Is this understanding correct, and should all whois clients use the "-V"
query to pass their client ID to the whois server by default?

As an aside, the isProxyValid() function uses
InetAddresses.isInetAddress(), which suggests that the code should also
understand  "-V <version>,<ipv6-address>".  If this is correct+tested, the
documentation should be updated.

Nick