Allow `@hand` in `<emph>`; Allow `@hand` in `<dateline>`

[cthomasdta]

Dear all, I was checking if the issue was already raised and stumbled upon https://github.com/TEIC/TEI/issues/23#issuecomment-2061723249

3. make the @hand attribute available on <app>, <hi>, and <emph>

This seems not to have happened, at least in <emph>, @hand is not allowed.

So I ask for @hand to be allowed in <emph>. We want to use it the same way as @hand in <hi>, i.e. when another scribe is highlighting text (by underlining it for example), either as a more "typographical" sign (<hi>) or as a stronger emphasis, hence we need <emph> also.

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In the same direction I want to ask for @hand to be allowed in <dateline>, following up on a discussion started by Denise Jurst-Görlach here https://listserv.brown.edu/cgi-bin/wa?A2=TEI-L;d9f6e911.2403. There was no opposition on the list, on the contrary. So this also, as the previous request here, should not be problematic.

[sydb]

Save the slippery slope argument, and my misgivings about using @hand to signify the scribe who provided the highlighting of the content, rather than wrote the content, I see no reason not to have @hand on either <dateline> or <emph>.

[sabineseifert]

European subgroup at VF2F April 27:

• @hand is allowed in <hi>, therefore it should be allowed in <emph>
• @hand could be a subset of att.global.rendition

[sabineseifert]

Discussed in council meeting 2024-09-03: We will implement it, along with #2551

[joeytakeda]

@hand on emph now done (thanks to #2587); and now @martinascholger will add to dateline

[torstenroeder]

btw, <byline> might also need a @hand, I think this should be harmonized