Track "text direction" proposals/work

[VladimirAlexiev]

(split off from #136, starting at #136 (comment))

The N3 spec boldly cites new ways to specify text-direction of language-tagged literals:

• https://w3c.github.io/N3/spec/#example-12

"الرجل العنكبوت"^^i18n:ar-eg_rtl

• https://w3c.github.io/N3/spec/#compoundliteral

[
  rdf:value "الرجل العنكبوت" ;
  rdf:language "ar-eg" ;
  rdf:direction "rtl"
]

As @gkellogg says "There are arguments against i18n and Compound Literals".

• fix #136 #148 adds a Note (warning) and links to relevant work
• This issue is to ensure closure when a decision is made on "text direction" in the other WGs. Track:
  • base direction rdf-concepts#9
  • https://github.com/w3c/rdf-star-wg/blob/main/docs/text-direction.md

[VladimirAlexiev]

BTW, if I add lang name ttl to the first code block above, the whole line is written RTL:

"الرجل العنكبوت"^^i18n:ar-eg_rtl

Magic? No, just some quirk of Github's syntax highlighter.
I pity Arabic semantic web developers :-)

[william-vw]

We already have an ongoing issue to track this work: #127