"contactSearchGroup" (see Section 3.1.7).
This query also provides optional elements containing
language tags. Clients MAY use these elements to hint about the
natural language(s) of the affected element. Servers MAY use this
information in processing the query, such as in tailoring
normalization routines to aid in more effective searches.
3.1.6. Query
This query does a simple search for the domains being hosted by a
name server. The search is constrained by using either the host name
[12], host handle, IPv4 address, or IPv6 address of the name server.
3.1.7. Contact Search Group
Some of the queries above have similar query constraints for
searching on contacts. This section describes those common
parameters.
allows the query to be constrained based on the common
name of the contact. The constraint can constrain the query either
by an exact match using the element, or by a subset of
the common name using the and elements.
allows the query to be constrained based on the
organization name of the contact. It has the same semantics as the
element.
constrains the query based on the e-mail address of the
contact. This may be done by an exact e-mail address using the
element or by any e-mail address in a domain using the
element. The element MUST only contain a valid
domain name (i.e., without an '@' symbol), and the matching SHOULD
take place only on the domain given (i.e., no partial matches with
respect to substrings or parent domains). If either the contents of
the element or the domain part of the contents of the
element contain a name with non-ASCII characters, they
MUST be normalized according to the processes of RFC 3491 [15].
The , , and elements restrict the scope of
the query based on the city, region, or postal code of the contact,
respectively. Each must only contain an element
containing the exact city, region, or postal code (i.e., no substring
searches).
3.2. Result Derivatives
3.2.1. Privacy Labels
Several of the results in this registry type have values that cannot
be given but must be specified as present or must be flagged so that
clients do not divulge them. In order to achieve this, some of the
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