Hi all,

I added https://wiki.contextgarden.net/Chinese_Japanese_and_Korean#Meeting_the_JIS_X_4051_Requirements_for_Japanese_Text_Layout
with attached working example code and to-do list.
Thanks for any contributions!
The working example code is still a work in progress. Its text layout output meets already some of the requirements (see comments in the code). Among the ones to still be implemented are:
solid setting (no extra spacing between characters) https://www.w3.org/TR/jlreq/#fig1_8 if no requirement for line-adjustment https://www.w3.org/TR/jlreq/#term.line-adjustment
aligning of the lines to the Kihon-hanmen (optimizing the code below in this regard)

positioning and realm of headings https://www.w3.org/TR/jlreq/#fig3_1_9 https://www.w3.org/TR/jlreq/#fig3_1_15 et al, and https://www.w3.org/TR/jlreq/#fig3_1_4

positioning of yokugo-ruby https://www.w3.org/TR/jlreq/#fig2_3_24

inline cutting note (warichu) https://www.w3.org/TR/jlreq/#fig2_4_1

emphasis with sesame dot or bullet

itemization https://www.w3.org/TR/jlreq/#fig2_5_6

indenting of quotation paragraphs https://www.w3.org/TR/jlreq/#fig2_5_7

tab setting https://www.w3.org/TR/jlreq/#fig2_6_1

furiwake https://www.w3.org/TR/jlreq/#fig2_7_2

jidori https://www.w3.org/TR/jlreq/#fig2_7_4

math https://www.w3.org/TR/jlreq/#fig2_7_6 and https://www.w3.org/TR/jlreq/#fig2_7_62

tategaki (writing vertically)

Best regards

Emanuel
On März 2 2024, at 7:00 pm, Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> wrote:
> Emanuel Han schrieb am 01.03.2024 um 16:23:
> >
> > Dear Wolfgang,
> > thank you for your valuable remarks. I integrated them, see corrected attached example.
> > Yes, correct layout examples exist. They're all showing vertical writing, but the rules and principles are exactly the same for horizontal writing.
> > position of the headers and footers: https://www.w3.org/TR/jlreq/#fig1_30
> See my attached gongitsune.tex example how you can squeeze text in a very narrow header/footer.
> > aligning lines to the text box: https://www.w3.org/TR/jlreq/#fig1_3
> You can use the lines key for \setuplayout to let ConTeXt calculate the necessary value for the text height.
> > protrusion of ruby: https://www.w3.org/TR/jlreq/#fig_ad1_6
> You're getting this for free because ruby text doesn't take up vertical space, in case vertical text is working it would now stick into the margins as expected.
> \starttext
> \ruledhbox{a \ruby{x}{y} b}
> \stoptext
>
>
> >
> > In my previous mail, I wrote wrong amounts of lines. They should be 46 lines on one page, while the actual example doesn't show the 46th line.
> > It would be important to identify the reason why only 24 characters are used to create a line when 25 could be used. Then we can develop a method to turn that mechanism off or circumvent it.
> > Quotation from https://www.w3.org/TR/jlreq:
> > In principle, when composing a line with ideographic (cl-19) (https://www.w3.org/TR/jlreq/#cl-19), hiragana (cl-15) (https://www.w3.org/TR/jlreq/#cl-15) and katakana (cl-16) (https://www.w3.org/TR/jlreq/#cl-16) characters, no extra spacing appears between their character frame (https://www.w3.org/TR/jlreq/#term.character-frame). This is called solid setting (see Figure 5 (https://www.w3.org/TR/jlreq/#fig1_8)).
>
>
> 1. ConTeXt has a mechanism to typeset Japanese texts.
> 2. There are flaws in the output it produces but this nothing which can't be fixed.
> 3. To fix the problems someone has to be passionate to fix them and we're willing to help here.
> As you can see in my second example file japanese.tex there is a font feature to create half sized parentheses etc. which isn't supported yet by ConTeXt's mechanism for japanese and in case your willing to improve it this should be taken care of as well.
> Wolfgang