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matching rules for directoryString [was: Re: CIM24 schema tweaks]
rmoats@coreon.net wrote:
>
.[snip]
> What do you suggest as the
> equality match? Based on my reading of the X.500-series and
> LDAP RFCs the only option for Directory Strings is
> caseIgnoreMatch, and I'm not at all comfortable with
> declaring that as the matching rule for a syntax that holds
> UTF-8 strings.
[snip]
>
I'm reading X.501 and X.520 from
ftp://ftp.bull.com/pub/OSIdirectory/4thEditionTexts/ (hurry for your
copy). Although these are drafts from the 4th edition of the X.500
series, it does not appear that the sections which apply to this
immediate issue are new or different from current/previous documents.
X.501 requires that the assertion syntax of the matching rule and
the syntax of attributes to which the matching rule is applied
must be equivalent. See section 13.5.
X.520 defines a caseExactMatch rule which applies to directoryString
attributes. See section 6.1.4.
Section 8 of RFC2252 does not mention a caseExactMatch rule which
applies to directoryString attributes. But neither does it appear that
section 8 was intended to describe the entire universe of allowable
or appropriate matching rules. Nothing in RFC2252's section 8 precludes
a Directory implementation from supporting matching rules beyond those
which are enumerated.
Section 3.3 of RFC2251 asserts LDAP's relationship to X.500 and the
requirement for LDAP servers to support the X.500 data and service
models.
Based on these facts, think it is reasonable to specify caseExactMatch
for directoryString attributes. Further, I think it is reasonable to
expect that Directory implementations will support it.
Also see http://www.alvestrand.no/objectid/2.5.13.5.html
Note that the specification of caseExactMatch for directoryString
attributes did not prevent RFCs 2713 and 2714 from obtaining.
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