OPC: Normative references

[MURATA Makoto]

Dear colleagues,

I am reviewing normative references of the OPC revision draft.

1) XML 3th edition

We should drop XML 3th edition since we already have the 4th edition
as a normative reference.

2) Reference to RFC 4234 (ABNF)

We have two problems.  First, this RFC is obsoleted by RFC 5234.
Second, we borrow path segments defined RFC 3986 and 3987, but they
use RFC 2234, which is obsoleted by RFC 4234.

I think that we should use the latest version, RFC 5234.  RFC 7231
does the same thing even though it references the non-terminal defined
RFC 3987.  To mimic RFC 7231, we should also introduce a production
rule:

     isegment-nz       = <isegment-nz, see [RFC3987], Section 2.2>

3) W3C DTF

W3C DTF is a W3C Note rather than a recommendation.  We are not
allowed to reference a W3C Note, unless we create a reference
explanatory report.

I am wondering if we can migrate to gYear, gYearMonth, date, and
datetime of W3C XML Schema Part 2.

Regards,
Makoto
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