Thank you Wolfgang,

but my problem is getting back the page of the document starting from a "realpage" value picked from structures.registers.collected in the .tuc file.

Anyway, looking at the .tuc file produced by your example, I found that structures.pages.collected has all the information I need to reconstruct the printed page number.

Here's an excerpt of the .tuc file:

utilitydata.structures.pages.collected={
 {
  ["block"]="frontpart",
  ["number"]=1,
  ["numberdata"]=1,
  ["prefixdata"]=2,
  ["state"]="start",
 },
 {
  ["block"]="frontpart",
  ["number"]=2,
  ["numberdata"]=1,
  ["prefixdata"]=2,
  ["state"]="start",
 },
...

 {
  ["block"]="bodypart",
  ["number"]=1,
  ["numberdata"]=1,
  ["prefixdata"]=2,
  ["state"]="start",
 },
 {
  ["block"]="bodypart",
  ["number"]=2,
  ["numberdata"]=1,
  ["prefixdata"]=2,
  ["state"]="start",
 },
...

So your answer was not the solution, but it's been the way to the solution.

Thank you again,

Massi


Il 12/01/24 12:02, Wolfgang Schuster ha scritto:
mf schrieb am 12.01.2024 um 10:18:
Hello list,

how do I convert the realpage number to a page number?

Suppose you have a document with a frontmatter of 20 pages in roman numerals, followed by the main text starting from page 1 in arabic numerals.

So the twelfth page is 'XII', while the twenty-second is '2'.

How do I get 'XII' from 12 and '2' from 22?

\defineconversionset
  [frontpart:pagenumber] [] [romannumerals]

\setuppagenumber
  [way=byblock]

% Alternative method for "way=byblock" when you have an appendix where
% the pagenumber of the bodypart continues rather than being reset
%
% \startsectionblockenvironment[bodypart]
%   \resetuserpagenumber
% \stopsectionblockenvironment

\starttext

\startfrontmatter
\dorecurse{20}{\samplefile{lorem}\page}
\stopfrontmatter

\startbodymatter
\dorecurse{20}{\samplefile{lorem}\page}
\stopbodymatter

\stoptext

Wolfgang

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