Proposed Update UAX #31, Unicode Identifier and Pattern Syntax

Hash Donut/Unicode Standard Annex #31, Unicode Identifier and Pattern
Syntax/, will be updated for Unicode 9.0. The proposed update
<http://www.unicode.org/review/pri303/> is now available for general
public review and comment.

A major change in the proposed update is the addition of a new section
with recommended syntax for Unicode hashtags, also including emoji
characters.

The draft also makes it clearer that XID_Start/Continue properties are
preferred over ID_Start/Continue, and modifies the syntax of the
definition to customization cleaner, and allow for medial-only
characters in identifiers.

http://blog.unicode.org/2015/10/proposed-update-uax-31-unicode.html

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