Special problems with roman numerals

We've run into two problems with Roman numerals:

Old-style ("backwards-c") Roman numerals.
Overlining of Roman numerals.

Old-style Roman numerals.
- The Problem:
  Of the letters used commonly in Roman numerals (IVXLCDM), two, namely "M" and "D," can appear in a variant form that makes use of an extra character that resembles a backwards-facing letter "c," combined with "I" and regular "c". (Since I can't represent a backwards "c" on the keyboard, I'll use "(" for "c" and ")" for backwards-c in what follows.)
  "(I)" is a variant form of "M"
  "I)" is a variant form of "D"
  (If you look closely, you'll see that "(|)" almost looks like an "M" and "I)" almost looks like a "D").
- The Solution:
  In Roman numerals, represent the combination "(I)" as "M" and "I)" as "D".
- Examples:
  See below.
Overlining of Roman numerals.
- The Problem:
  Roman numerals are frequently overlined (either to indicate that they *are* numerals, or, more rarely, as a "multiplier").
- The Solution:
  In accordance with the usual instructions, treat the overlining as a "generic abbreviation stroke"; that is, do not capture the line as such, but simply place the entire numeral in <ABBR> tags, in the same way that you would place an overlined word in <ABBR> tags.
- Examples:
  See below.

Examples of "old-style" Roman numerals "D" and "M".

Appears as:	Capture as:
	M.D.C.
	M.D.CI.
	M.D.C.VII.
	M.D.IC.
	M.D.<HI>xcv.Martij iij.</HI>
	B. A. LXV. M.V. D. XX. &THETA;· A. M.D. XC. P. id. Feb. Io. F. amici&abque; Basileae p.
	May. IX. M.DC.XII.

Examples of overlined Roman numerals

Appears as:	Capture as:
	<HI>Hen.</HI> <ABBR>VII.</ABBR>)
	by <ABBR>XII.</ABBR>
	his <ABBR>II.</ABBR> pillars
	(to the <ABBR>IV.</ABBR> Canto)
	<ABBR>M.DCCCC.</ABBR>
	<ABBR>M.DCCC.</ABBR>

A NOTE ON NUMERICALLY VERY LARGE ROMAN NUMERALS

You may (rarely) find a similar system used to express larger numbers as Roman numerals. In the one book we've seen so far that does this (W_H2513, vid 59020/519-20), a fairly straigtforward system is used that involves adding a layer of "(" and ")" for each power of ten. Thus (note the suggested character entity at the right of each line):

(|) = 1000 = M

((|)) = 10000 = &rn10000; (cp. unicode #2182)

(((|))) = 100000 = &rn100000;

((((|)))) = 1000000 = &rn1000000;

|) = 500 = D

|)) = 5000 = &rn5000; (cp. unicode #2181)

|))) = 50000 = &rn50000;

|)))) = 500000 = &rn500000;

For the moment, we have decided to continue to 'interpret' such Roman numerals rather than record the individual pieces such as the backwards-C. Examples follow.

<ITEM>M. M. <ABBR>I.</ABBR> ∞. a Thousand.</ITEM>
<ITEM>MM. MM. <ABBR>II.</ABBR> two Thousand.</ITEM>

<ITEM>&rn5000;. <ABBR>V.</ABBR> Five Thousand.</ITEM>
<ITEM>&rn5000;M. <ABBR>VI.</ABBR> Six Thousand.</ITEM>

<ITEM>M^x &rn10000; <ABBR>X.</ABBR> &revC;MC. or lMl. Ten Thousand.</ITEM>
<ITEM>&rn10000;M. <ABBR>XI.</ABBR> Eleven thousand.</ITEM>

<ITEM>&rn10000;&rn5000;. <ABBR>XV.</ABBR> Fifteen thousand.</ITEM>
<ITEM>&10000;&rn5000;M. <ABBR>XVI.</ABBR> Sixteen thousand.</ITEM>

<ITEM>&rn50000;. <ABBR>L.</ABBR> L∞ Fifty thousand. <ABBR>lMl.</ABBR></ITEM>
<ITEM>&rn50000;&rn10000;. <ABBR>LX.</ABBR> Sixty thousand. <ABBR>lMlM.</ABBR></ITEM>

<ITEM>&rn100000;. <ABBR>C.</ABBR> C∞ Hundred thousand</ITEM>

<ITEM>&rn500000;. <ABBR>D.</ABBR> D∞ Five hundred thousand.</ITEM>

<ITEM>&rn500000;&rn100000;. <ABBR>DC.</ABBR> Six hundred thousand.</ITEM>

<ITEM>&rn1000000;. <ABBR>M.</ABBR> a Million, ten hundred thousand.</ITEM>
<ITEM>M^D^D. M^M. the same.</ITEM>

NOTES

This same book seems to use the infinity sign as a symbol for one thousand. Go ahead and use the usual ISO entity "infin".
This same book seems to use the "lazy-s" sign for two hundred. I don't understand why, but I guess we can add a character entity for lazy-s, viz., &lazyS; (cp. unicode #223D).
In the 10,000 line of this same page is a rendering that uses M combined with the backwards-c, namely )M(. This seems to be the only figure that we can't deal with using the characters mentioned above. So I guess we'll need a "reversed-C" character after all, just this once = &revC; (cp. unicode #2183). Read &revC;MC. If any other numbers turn up that don't fit any of the models, feel free to use this character for the "backwards-c" by itself.

(\|)	= 1000	= M
((\|))	= 10000	= &rn10000;	(cp. unicode #2182)
(((\|)))	= 100000	= &rn100000;
((((\|))))	= 1000000	= &rn1000000;
\|)	= 500	= D
\|))	= 5000	= &rn5000;	(cp. unicode #2181)
\|)))	= 50000	= &rn50000;
\|))))	= 500000	= &rn500000;