Fixing small bug in PR

Hi all,

maybe you have already noticed that there was small error found two
weeks ago in the schema and one test file.

For lineBreakType datacategory (http://www.w3.org/TR/its20/#storagesize)
the specification allows three values -- "cr", "lf" and "crlf".
Unfortunately schema contained typo and had "lr" value instead of "lf"
present. Also schema contained additional value "nel" which was dropped
during the specification development.

Fix in schema is easy and has been already done in the repository.
However there is a risk that such change will be perceived as
substantial and another last call will be needed instead of fixing small
error in schema and publishing final recommendation.

Currently appendix D with schemas is marked as normative and change in
schema thus might be perceived as substantive. One way to diminish this
risk is to make this appendix informative. Actually if you will take
time to read conformance section
(http://www.w3.org/TR/its20/#conformance-product-processing-expectations) there
is no reference to schemas in appendix D, there is just written that
markup *may* be valid against schema conforming to markup declarations
in section 8.

Also it is not very good to have one thing defined normatively in two
places -- it's not clear which definition has precedence in case of
discrepancies. Again marking appendix D as informative will solve this.

My suggestion is thus to fix schemas and mark appendix D as informative
(non-normative). If you disagree please provide your preferred solution
to this issue so we can discuss and decide during Wednesday call.

    Jirka

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