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Re: Extensibility of SearchRequest.attributes
Yeah, I just popped these off the top of my head--some are more
reasonable than others. I'm not sure that I plan to implement any or all
of them. The nice thing about not defining a control is that clients
don't have to be re-compiled.
>>> Mark C Smith <mcs@netscape.com> 4/4/03 8:24:37 AM >>>
OK; thanks for the list. I hope I never have to implement support for
all of these in a server (not that each one is very difficult; this is
just a long list).
A side note: it makes sense to me to express concepts like "all" in an
AttributeDescriptionList, but I think it makes more sense to use a
control to modify how the entire list is processed. So I would use a
control to express these concepts from your list of examples:
> "*Len<"<len> All User Attr val's less than len octets
> "^" No virtual attributes
> "^^" No collective attributes
> "$" Only static (no dynamically calculated) attributes
> ":-(" Attributes with deleted/unpurged values
The "*Len<" one is included because I might want to say "return values
for attributes a, b, c whose length is less than 1000 octets" or
"return
all operational attributes whose length is less than 512 octets."
Controls have other nice properties: collisions can't happen (due to
use
of OIDs), handling of unknown controls is well defined, etc.
-Mark Smith
Netscape
Jim Sermersheim wrote:
> Yes, here are some examples of special attributes:
>
> Attribute Meaning
> "*" All User Attrs (P-S RFC)
> "+" All Operational Attrs (S-T I-D)
> "+"<classname> All Attributes of an object class (I-T I-D)
> "*;lang-"<xx> All User Attrs with lang-xx (no spec yet on
> remaining)
> "@"<uri> All Attrs listed at uri
> "*MCSN>"<csnval> All User Attrs who's mod CSN is greater than that
> specified
> "*Len<"<len> All User Attr val's less than len octets
> "^" No virtual attributes
> "^^" No collective attributes
> "$" Only static (no dynamically calculated) attributes
> ":-(" Attributes with deleted/unpurged values
> "+dirOp" All directoryOperation operational
> "+distOp" All distributedOperation operational
> "+dsaOp" All dsaOperation operational
> "#"<syntaxOID> All attributes belonging to specified syntax
>
> Obviously, there are many (inconsistent) ways to express these, and
> there are no guidelines or instructions to those who want to create
new
> special attributes but don't want to collide with special attributes
> being defined by other people.
>
> Jim