"overscored" or "overlined" text … (or whatever it should be called)

[Robert Blackstone <blackstone.robert@gmail.com>]

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Dear all,

I am trying to reproduce with ConTeXt an old french text that contains numerous abbreviations, mostly of two types:
- words cut off by means of a "period", with the last letter of the complete word as a superscript above the period.
- "overscores"
  --either for single characters, for instance in words with double consonances, like "comme". One of these is sometimes omitted and replaced by an "overscore" on the previous vowel
  -- or on an entire abbreviation, such as "coe" for "comme" and "nre" for "notre"; they become coe and nre overscored.

Now I would like to reproduce these as closely as possible.

For the "period + superscript letter" I found  a solution: \lohi[]{\cdot}{t} (for superscript t), nearly perfect. The only imperfection I can see is that the dot sits slightly below the baseline. Is there a way to get it on the baseline?

The overscore on a single character presents no problem.

For an overscore on a complete word I have not found a solution. 
Three individual overscores on a three-letter word give a broken line; I do not know how to merge the three line components. (Incidentally, this hack does not work with mkiv)

The other solution I have tried is to put the word in a frame with a top-frame only. But this way the word (abbreviation) hangs underneath the base-line. 
Using \inframed instead of \framed  makes no difference. There appears not to be something like \setupinframed.

I have attached an example.

Thanks in advance for any help.

Regards,

Robert Blackstone


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\setupframed[location=middle,width=fit,topframe=on,leftframe=off,rightframe=off,bottomframe=off,strut=no]
\starttext

Lo{\" u}is, par la grace de Dieu, Roy de France et de Navarre, {\` a} nos am{\' e}s et feaux Conseillers[,] les gens tenant nos Cours de Parlem\lohi[]{\cdot}{t}[,] M\lohi[]{~\cdot}{res} des requ{\^ e}tes ord\lohi[]{~\cdot}{es} de {\= n}{\= r}{\= e}   H{\^ o}tel, Grand Conseil, Prev{\^ o}t de Paris, Baillifs, senechaux, leurs Lieuten\lohi[]{~\cdot}{ts}  civils, et autres nos Justiciers qu'il appartiendra salut. Notre bien aim{\' e} Jaques Hotteterre l'un des Musiciens de {\= n}{\= r}{\= e}  Chambre pour la Fl.\  Trav\lohi[]{~\cdot}{re}  nous a fait exposer qu'il desireroit donner au public divers Ouvrages de Musiq; tant vocale, qu'instrumentale, et pour les Fl.\ Traversieres a 2.\ ou plus\lohi[]{~\cdot}{rs}  parties de sa composition, s'il nous plaisoit de luy accorder nos lettres de Privil
 {\' e}ge pour la ville de Paris seulement.  
\bigskip
Unacceptable alternatives for  {\= n}{\= r}{\= e}: de \framed{nre}   H{\^ o}tel, de \inframed{nre}   H{\^ o}tel, de \framed[height=0.7em]{nre} H{\^ o}tel, de \high{\framed{nre}}   H{\^ o}tel, 

\stoptext 

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